Pro Grade M35 Cobalt Step Drill Bit Set With CBN Ground And AlTiN Coating, One Quarter Inch Hex Shank, Includes 6, 10 And 13 Steps From One Eighth To Three Quarters Inch, Heavy Duty Metalworking For Sheet Metal And Stainless Steel
✔️ 6-step, 10-step, 13-step set from 1/8 to 3/4 in in a stack case
This heavy-duty metalworking drill bit set uses M35 cobalt steel with a CBN-ground edge and an AlTiN coating to resist heat. It’s ideal for stainless steel, hardened sheet metal, and structural steel, and the 1/4" hex shank fits most impact drivers and drills. The three included sets cover common knockout sizes in a stackable case.
✅ M35 cobalt steel with ~5% cobalt for heat resistance and edge retention
✅ CBN-ground edges maintain sharpness from tip through all steps
✅ AlTiN coating reduces friction and heat buildup
✅ Sets: 6-step (3/16-1/2 in), 10-step (3/16-3/4 in), 13-step (1/8-1/2 in) with mm equivalents (4.76-12.7 mm; 4.76-19.05 mm; 3.18-12.7 mm)
✅ 1/4 in quick-change hex shank fits most impact drivers and drills
✅ One-piece solid HSS construction with no welded joints
✅ Stackable interlocking case keeps bits organized on site
💡 What is a cobalt step drill set used for? Handy for metal fabrication and electrical panel work. - Drilling clean, stepped holes in stainless steel and hardened sheet metal - Making knockouts in electrical panels and enclosures - AlTiN coating reduces friction and extends cutting life