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3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling
3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling 3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling 3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling 3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling 3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling 3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

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Product details

Management number 218148457 Release Date 2026/05/03 List Price US$11.60 Model Number 218148457
Category
  1. Tools & Home Improvement
  2. Power & Hand Tools
  3. Power Tool Parts & Accessories
  4. Power Drill Parts & Accessories
  5. Drill Bits
  • 【Premium M35 Cobalt Construction】 Engineered from industrial-grade M35 cobalt high-speed steel with a TiAlN coating, these step drill bits deliver exceptional hardness, heat resistance, and cutting performance. Designed to stay sharper longer—ideal for drilling through stainless steel, iron, aluminum, and other tough metals.
  • 【Superior Cutting Efficiency】 Each bit is heat-treated and hardened to 64–67 HRC, ensuring precise, burr-free holes even in hard materials. The spiral flute design promotes smooth chip evacuation, reduces friction, and prevents clogging for faster, cleaner drilling.
  • 【Wide Size Range & Compatibility】 Includes three step drill bits covering a range from 1/8" to 7/8" (1/8"-1/2", 1/4"-3/4", and 3/16"-7/8"), suitable for hole enlargement or new drilling. Compatible with drill presses, milling machines, and cordless drills—perfect for professionals and DIY metalworkers alike.
  • 【Maximize Tool Life with Proper Use】 For optimal performance, use cooling oil and maintain a low drill speed (250–400 RPM) when cutting metal. Avoid using impact drivers to prevent uneven torque and premature wear—ensuring your bits last longer and perform consistently.
Set Name 3PCS-Cobalt Step Drill Bit Set
Brand Name ColumPRO
Shank Type 3-Flat
Unit Count 3.0 Count
Part Number O120-3PCS SAE
Finish Types Titanium Aluminum Nitride
Manufacturer ColumPRO
Material Type M35 High-Speed Steel
Tool Flute Type Spiral
Number of Flutes 3
Number of Pieces 3
Surface Recommendation Aluminum, Iron, Stainless Steel

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

3PCS Cobalt Step Drill Bit Set for Stainless Steel & Hard Metal,M35 HSS Unibit with TiAlN Coating,Spiral Flute Design,1/8"-1/2", 1/4"-3/4", 3/16"-7/8" for Iron, Aluminum, and Alloy Drilling

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