Cobalt Step Drill Bit Set With 1/4 Inch Hex Shank For Metal Boss Grade M35 HSS Co Alloy Drills Stainless Steel And Steel With Double Straight Flute For Top Notch Heat Resistance And Long Lifespan Plus Smooth Clean Hole Starts
✔️ 9-size cobalt HSS set (4mm-12mm) for heat resistance
This compact kit packs 9 progressive steps from 4mm to 12mm in one easy-to-use Unibit style set, designed for metalworking tasks like sheet metal, plumbing pipes, and conduit work. It’s built to handle stainless steel, copper, aluminum, and other hard metals with precision and long life.
✅ Premium cobalt construction with 5% cobalt alloy for heat resistance
✅ 9-step size range from 4mm to 12mm for precise hole sizes
✅ 1/4" hex shank prevents slippage and increases torque
✅ Double straight flutes for faster chip removal and cooler operation
✅ Compatible with standard drills and impact drivers
💡 What is a cobalt steel step drill bit set used for in metalworking projects and why choose it? This handy tool helps you drill clean, burr-free holes in tough metals with controlled heat. - 5% cobalt boosts heat resistance for stainless steel and hard alloys - 4mm-12mm nine-step sizes cover common hole sizes - 1/4 inch hex shank ensures secure grip in drills and impact drivers
✝️