Step Drill Bit Set For Metal With Four Spiral Flute Bits 5-Piece 0.125 To 1.375 Inch Range AITIN Coated Hex Shank 0.25 Inch For Stainless Steel Aluminum Wood Plastic Pro Grade Drilling With Smooth Clean Holes COMOWARE

5-Piece metal step drill bit set: 1/8 in to 1-3/8 in range, coated
✔️ M2 cobalt steel, AlTiN coated, hex shank 0.25 in, fast clean holes

This five-piece step drill bit set is designed for metalworking, letting you drill clean, stepped holes in stainless steel, aluminum, and other metals. It’s ideal for automotive, cabinetry, and DIY projects where precise, fast hole formation is needed.

✅ Spiral flute design reduces walking and increases stability
✅ Made from M2 cobalt high-speed steel for toughness and heat resistance
✅ AlTiN coating delivers 67HRC hardness for wear and heat resistance
✅ 5-step sizes from 1/8 in to 1-3/8 in (3.2-35 mm) for varied thicknesses
✅ For mild steel up to 1/8 in (3 mm) and stainless steel up to 1 mm; use cutting oil or coolant for best results

💡 What is a step drill bit used for in metalworking and why choose cobalt and AlTiN coated options? A step drill bit is handy for drilling clean, stepped holes in metal and other materials. - Useful for creating multiple hole sizes with a single bit - Reduces tool changes and speeds up fabrication - Cobalt tips tolerate heat when drilling hard alloys - AlTiN coating extends life under heavy use