{"title":"Fabricating • Machining • Drill Bits • Step Drill Bits","description":"Step drill bits are essential tools used by professionals in a variety of industries such as electrical, plumbing, and metalworking. These specialized drill bits are designed with multiple stepped cutting edges, allowing for efficient drilling of holes with different diameters.One of the primary uses of step drill bits is for drilling holes in sheet metal or thin materials. They are commonly employed in electrical installations, HVAC systems, or automotive applications where precise and clean holes are required. The stepped design of these drill bits allows for gradual hole enlargement without the need for constantly changing drill bits.Step drill bits are also highly useful for deburring or chamfering edges of drilled holes. The progressive steps on the bit provide smooth transitions between different hole sizes, ensuring a clean finish and reducing the risk of sharp edges that could cause injury.In addition to metal, step drill bits can be used on various other materials like plastic, wood, or composites. They typically have a hexagonal shank, allowing for secure attachment to power drills or drill presses.When using step drill bits, it's important to apply consistent pressure and use a slow drilling speed to prevent overheating or snagging. Lubrication may be necessary when drilling through certain metals to prolong the life of the drill bit and improve cutting performance.","products":[{"product_id":"p-1168789","title":"Step Drill Bit 4mm to 12mm 5 Sizes HSS M35 Cobalt Straight Flutes Hex Shank for Metal Wood Plastic","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLaser marking makes the size more clear;\u003c\/p\u003e\u003cp\u003eHigh speed steel for longer service life;\u003c\/p\u003e\u003cp\u003eUsed on electric drills and drill presses;\u003c\/p\u003e\u003cp\u003eDouble cutting edges design enables a faster and smoother cutting;\u003c\/p\u003e\u003cp\u003eHex shank prevents slip in electric drills and presses' chuck;\u003c\/p\u003e\u003cp\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003c\/p\u003e\u003cp\u003eThe sharpness ensures easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMaterial: M35 Cobalt\u003c\/p\u003e\u003cp\u003eShank Size: 6.3mm \/ 0.25 inch\u003c\/p\u003e\u003cp\u003eStep Quantity: 5\u003c\/p\u003e\u003cp\u003eTotal Length: 70mm \/ 2.8 inches\u003c\/p\u003e\u003cp\u003eCutting Diameters: 4mm,6mm,8mm,10mm,12mm\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePackage Content:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e1 x Step Drill Bit\u003c\/p\u003e\u003cp\u003e1 x Plastic Package\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMaintenance Tips:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e1.Not for hammer drill.\u003c\/p\u003e\u003cp\u003e2.It is recommended to oil the bit before every use.\u003c\/p\u003e\u003cp\u003e3.Please drill a smaller hole to make drilling smoother.\u003c\/p\u003e\u003cp\u003e4.Please do not set drilling speed too high to avoid damages to cutting edge.\u003c\/p\u003e\u003cp\u003e5.The metal sheet on which you want to drill should not exceed 0.38\" in thickness.\u003c\/p\u003e\u003cp\u003e6.Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, for it may cause the drill bit broken and make drill hole too large.\u003c\/p\u003e","brand":"uxcell","offers":[{"title":"Default Title","offer_id":42112503382265,"sku":"a19042700ux0277","price":10.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/products\/ux_a19042700ux0277_ux_g02.jpg?v=1638222062"},{"product_id":"p-1124389","title":"Step Drill Bit HSS4241 1\/8\" to 1\/2\" 13 Sizes Straight Flutes Triangular Shank for Metal Wood Plastic 2Pcs","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLaser marking makes the size more clear;\u003c\/p\u003e\u003cp\u003eHigh speed steel for longer service life;\u003c\/p\u003e\u003cp\u003eUsed on electric drills and drill presses;\u003c\/p\u003e\u003cp\u003eDouble cutting edges design enables a faster and smoother cutting;\u003c\/p\u003e\u003cp\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003c\/p\u003e\u003cp\u003eThe sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSurface Treatment: Titanium Coated\u003c\/p\u003e\u003cp\u003eMaterial: High Speed Steel 4241\u003c\/p\u003e\u003cp\u003eShank Diameter: 6.3mm \/ 0.25 inch\u003c\/p\u003e\u003cp\u003eStep Quantity: 13\u003c\/p\u003e\u003cp\u003eTotal Length: 77mm \/ 3 inches\u003c\/p\u003e\u003cp\u003eCutting Diameters: 1\/8\", 5\/32\", 3\/16\", 7\/32\", 1\/4\", 9\/32\", 5\/16\", 11\/32\", 3\/8\", 13\/32\", 7\/16\", 15\/32\", 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Title","offer_id":42117718278393,"sku":"a20082700ux0719","price":10.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/products\/ux_a20082700ux0719_ux_g02.jpg?v=1638297141"},{"product_id":"p-1121465","title":"Step Drill Bit HSS4241 1\/8\" to 1\/2\" 13 Sizes Straight Flutes Triangular Shank for Metal Wood Plastic","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLaser marking makes the size more clear;\u003c\/p\u003e\u003cp\u003eHigh speed steel for longer service life;\u003c\/p\u003e\u003cp\u003eUsed on electric drills and drill presses;\u003c\/p\u003e\u003cp\u003eDouble cutting edges design enables a faster and smoother cutting;\u003c\/p\u003e\u003cp\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003c\/p\u003e\u003cp\u003eThe sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSurface Treatment: Titanium Coated\u003c\/p\u003e\u003cp\u003eMaterial: High Speed Steel 4241\u003c\/p\u003e\u003cp\u003eShank Diameter: 6.3mm \/ 0.25 inch\u003c\/p\u003e\u003cp\u003eStep Quantity: 13\u003c\/p\u003e\u003cp\u003eTotal Length: 77mm \/ 3 inches\u003c\/p\u003e\u003cp\u003eCutting Diameters: 1\/8\", 5\/32\", 3\/16\", 7\/32\", 1\/4\", 9\/32\", 5\/16\", 11\/32\", 3\/8\", 13\/32\", 7\/16\", 15\/32\", 1\/2\".\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003ePackage Content:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e1 x Step Drill Bit\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMaintenance Tips:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e1.Not for hammer drill.\u003c\/p\u003e\u003cp\u003e2.It is recommended to oil the bit before every use.\u003c\/p\u003e\u003cp\u003e3.Please drill a smaller hole to make drilling smoother.\u003c\/p\u003e\u003cp\u003e4.Please do not set drilling speed too high to avoid damages to cutting edge.\u003c\/p\u003e\u003cp\u003e5.The metal sheet on which you want to drill should not exceed 0.38” in thickness.\u003c\/p\u003e\u003cp\u003e6.Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, for it may cause the drill bit broken and make drill hole too large.\u003c\/p\u003e","brand":"uxcell","offers":[{"title":"Default Title","offer_id":42118007849209,"sku":"a20082700ux0718","price":8.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/products\/ux_a20082700ux0718_ux_g02.jpg?v=1638301593"},{"product_id":"p-1121463","title":"Step Drill Bit HSS4241 3\/16\" to 1\/2\" 6 Sizes Straight Flutes Triangular Shank for Metal Wood Plastic 2Pcs","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLaser marking makes the size more clear;\u003c\/p\u003e\u003cp\u003eHigh speed steel for longer service life;\u003c\/p\u003e\u003cp\u003eUsed on electric drills and drill presses;\u003c\/p\u003e\u003cp\u003eDouble cutting edges design enables a faster and smoother cutting;\u003c\/p\u003e\u003cp\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003c\/p\u003e\u003cp\u003eThe sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSurface Treatment: Titanium Coated\u003c\/p\u003e\u003cp\u003eMaterial: High Speed Steel 4241\u003c\/p\u003e\u003cp\u003eShank Diameter: 6.3mm \/ 0.25 inch\u003c\/p\u003e\u003cp\u003eStep Quantity: 6\u003c\/p\u003e\u003cp\u003eTotal Length: 58mm \/ 2.3 inches\u003c\/p\u003e\u003cp\u003eCutting Diameters: 3\/16\", 1\/4\", 5\/16\",  3\/8\", 7\/16\", 1\/2\".\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003ePackage Content:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e2 x Step Drill Bit\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMaintenance Tips:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e1.Not for hammer drill.\u003c\/p\u003e\u003cp\u003e2.It is recommended to oil the bit before every use.\u003c\/p\u003e\u003cp\u003e3.Please drill a smaller hole to make drilling smoother.\u003c\/p\u003e\u003cp\u003e4.Please do not set drilling speed too high to avoid damages to cutting edge.\u003c\/p\u003e\u003cp\u003e5.The metal sheet on which you want to drill should not exceed 0.38” in thickness.\u003c\/p\u003e\u003cp\u003e6.Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, for it may cause the drill bit broken and make drill hole too large.\u003c\/p\u003e","brand":"uxcell","offers":[{"title":"Default Title","offer_id":42118163693817,"sku":"a20082700ux0721","price":10.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/products\/ux_a20082700ux0721_ux_g02.jpg?v=1638303052"},{"product_id":"p-1121464","title":"Step Drill Bit HSS4241 3\/16\" to 1\/2\" 6 Sizes Straight Flutes Triangular Shank for Metal Wood Plastic","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLaser marking makes the size more clear;\u003c\/p\u003e\u003cp\u003eHigh speed steel for longer service life;\u003c\/p\u003e\u003cp\u003eUsed on electric drills and drill presses;\u003c\/p\u003e\u003cp\u003eDouble cutting edges design enables a faster and smoother cutting;\u003c\/p\u003e\u003cp\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003c\/p\u003e\u003cp\u003eThe sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSurface Treatment: Titanium Coated\u003c\/p\u003e\u003cp\u003eMaterial: High Speed Steel 4241\u003c\/p\u003e\u003cp\u003eShank Diameter: 6.3mm \/ 0.25 inch\u003c\/p\u003e\u003cp\u003eStep Quantity: 6\u003c\/p\u003e\u003cp\u003eTotal Length: 58mm \/ 2.3 inches\u003c\/p\u003e\u003cp\u003eCutting Diameters: 3\/16\", 1\/4\", 5\/16\",  3\/8\", 7\/16\", 1\/2\".\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003ePackage Content:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e1 x Step Drill Bit\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMaintenance Tips:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e1.Not for hammer drill.\u003c\/p\u003e\u003cp\u003e2.It is recommended to oil the bit before every use.\u003c\/p\u003e\u003cp\u003e3.Please drill a smaller hole to make drilling smoother.\u003c\/p\u003e\u003cp\u003e4.Please do not set drilling speed too high to avoid damages to cutting edge.\u003c\/p\u003e\u003cp\u003e5.The metal sheet on which you want to drill should not exceed 0.38” in thickness.\u003c\/p\u003e\u003cp\u003e6.Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, for it may cause the drill bit broken and make drill hole too large.\u003c\/p\u003e","brand":"uxcell","offers":[{"title":"Default Title","offer_id":42118717636857,"sku":"a20082700ux0720","price":8.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/products\/ux_a20082700ux0720_ux_g02.jpg?v=1638311484"},{"product_id":"p-1108939","title":"Step Drill Bits Set HSS 3-12mm 4-12mm 4-20mm Titanium Coated Straight Flutes Hex Shank for Metal Wood Plastic","description":"\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cbr\u003eLaser marking makes the size more clear;\u003cbr\u003eDouble cutting blades design enables a faster and smoother cutting;\u003cbr\u003eHexagonal shank prevents slip in electric drills and presses’ chuck;\u003cbr\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003cbr\u003eThe sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cbr\u003eMaterial: High Speed Steel\u003cbr\u003eSurface Treatment: Titanium Coated\u003cbr\u003eShank Diameter: 6mm \/ 0.24 inch\u003cbr\u003e\u003cstrong\u003e3-12mm:\u003c\/strong\u003e\u003cbr\u003eStep Quantity: 10\u003cbr\u003eTotal Length: 80mm \/ 3 inches\u003cbr\u003eCutting Diameters: 3mm\/0.12\", 4mm\/0.16\", 5mm\/0.2\", 6mm\/0.24\", 7mm\/0.28\", 8mm\/0.3\", 9mm\/0.35\", 10mm\/0.4\", 11mm\/0.43\",12mm\/0.47\"\u003cbr\u003e\u003cstrong\u003e4-12mm:\u003c\/strong\u003e\u003cbr\u003eStep Quantity: 5\u003cbr\u003eTotal Length: 70mm \/ 2.7 inches\u003cbr\u003eCutting Diameters: 4mm\/0.16”, 6mm\/0.24”, 8mm\/0.3”, 10mm\/0.4”, 12mm\/0.47”\u003cbr\u003e\u003cstrong\u003e4-20mm:\u003c\/strong\u003e\u003cbr\u003eStep Quantity: 9\u003cbr\u003eTotal Length: 72mm \/ 2.8 inches\u003cbr\u003eCutting Diameters: 4mm\/0.16\", 6mm\/0.24\", 8mm\/0.3\", 10mm\/0.4\",12mm\/0.47\", 14mm\/0.55\", 16mm\/0.6\", 18mm\/0.7\", 20mm\/0.8\"\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e\u003cbr\u003e3 x Step Drill Bits\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eMaintenance Tip:\u003c\/strong\u003e\u003cbr\u003e1.Not for hammer drill.\u003cbr\u003e2.It is recommended to oil the bit before every use.\u003cbr\u003e3.Please drill a smaller hole to make drilling smoother.\u003cbr\u003e4.Please do not set drilling speed too high to avoid damages to cutting edge.\u003cbr\u003e5.The metal sheet on which you want to drill should not exceed 0.38” in thickness.\u003cbr\u003e6.Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, for it may cause the drill bit broken and make drill hole too large.","brand":"uxcell","offers":[{"title":"Default Title","offer_id":42120478425337,"sku":"a18120800ux0205","price":12.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/products\/ux_a18120800ux0205_ux_g02.jpg?v=1638340913"},{"product_id":"p-1088413","title":"Step Drill Bit HSS 3mm to 13mm 11 Sizes Titanium Coated Straight Flutes Hex Shank for Metal Wood Plastic","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLaser marking makes the size more clear;\u003c\/p\u003e\u003cp\u003eHigh speed steel for longer service life;\u003c\/p\u003e\u003cp\u003eUsed on electric drills and drill presses;\u003c\/p\u003e\u003cp\u003eDouble cutting edges design enables a faster and smoother cutting;\u003c\/p\u003e\u003cp\u003eHex shank prevents slip in electric drills and presses’ chuck;\u003c\/p\u003e\u003cp\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003c\/p\u003e\u003cp\u003eThe sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSurface Treatment: Titanium Coated\u003c\/p\u003e\u003cp\u003eMaterial: High Speed Steel\u003c\/p\u003e\u003cp\u003eShank Size: 6.3mm \/ 0.25 inch\u003c\/p\u003e\u003cp\u003eStep Quantity: 11\u003c\/p\u003e\u003cp\u003eTotal Length: 76mm \/ 3 inches\u003c\/p\u003e\u003cp\u003eCutting Diameters: 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large.\u003c\/p\u003e","brand":"uxcell","offers":[{"title":"Default Title","offer_id":42124064751865,"sku":"a19042700ux0276","price":8.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/products\/ux_a19042700ux0276_ux_g02.jpg?v=1638384893"},{"product_id":"p-1084144","title":"Step Drill Bit Set Set 1\/4\"-3\/4\" 1\/8\"-1\/2\" 3\/16\"-1\/2\" HSS 4241 Titanium Coated Straight Flutes Hex Shank for Metal Wood Plastic","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cbr\u003eLaser marking makes the size more clear;\u003cbr\u003eUsed on electric drills and drill presses;\u003cbr\u003eDouble cutting edges design enables a faster and smoother cutting;\u003cbr\u003eHexagonal shank prevents slip in electric drills and presses’ chuck;\u003cbr\u003eX-type openings design to facilitate the removal of cutting waste when drilling;\u003cbr\u003eThe sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;\u003cbr\u003e \u003cbr\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cbr\u003eMaterial: High Speed Steel Shank\u003cbr\u003eSize: 6.3mm \/ 0.25 inch\u003cbr\u003e\u003cstrong\u003e3\/16\"-1\/2\"\u003c\/strong\u003e\u003cbr\u003eStep Quantity: 6\u003cbr\u003eTotal Length: 85mm \/ 3.3 inches\u003cbr\u003eCutting Diameters: 3\/16\",1\/4\",5\/16\",3\/8\",7\/16\",1\/2\"\u003cbr\u003e\u003cstrong\u003e1\/4\"-3\/4\":\u003c\/strong\u003e\u003cbr\u003eStep Quantity: 9\u003cbr\u003eTotal Length: 71mm \/ 2.8 inches\u003cbr\u003eCutting Diameters: 1\/4\",5\/16\",3\/8\",7\/16\",1\/2\",9\/16\",5\/8\",11\/16\",3\/4\"\u003cbr\u003e\u003cstrong\u003e1\/8\"-1\/2\":\u003c\/strong\u003e\u003cbr\u003eStep Quantity: 13\u003cbr\u003eTotal Length: 76mm \/ 3 inches\u003cbr\u003eCutting Diameters: 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large.\u003c\/p\u003e","brand":"uxcell","offers":[{"title":"Default Title","offer_id":44901090590969,"sku":"a19042700ux0273","price":13.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/files\/ux_a19042700ux0273_ux_g03.jpg?v=1777342566"},{"product_id":"p-1029651","title":"Step Drill Bit HSS 4241 4mm to 12mm 5 Sizes Titanium Coated Straight Flutes Hex Shank for Metal Wood Plastic","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLaser marking makes the size more clear;\u003c\/p\u003e\u003cp\u003eHigh speed steel for longer service life;\u003c\/p\u003e\u003cp\u003eUsed on electric drills and drill presses;\u003c\/p\u003e\u003cp\u003eDouble cutting blades design enables a faster and smoother cutting;\u003c\/p\u003e\u003cp\u003eHexagonal shank prevents slip in electric drills and presses’ chuck;\u003c\/p\u003e\u003cp\u003eX-type openings design to facilitate the removal of 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