Premium HSS Cobalt Spiral Step Drill Bit Set

High-speed steel with 8% cobalt alloy for extreme durability and heat resistance

Precision-ground spiral flutes ensure smooth drilling and efficient chip removal

Progressive step design handles multiple hole sizes with one bit (3mm to 20mm)

Industrial-grade titanium nitride coating reduces friction and extends bit life

Laser-etched size markings for quick identification during metalworking

Balanced 1/4" hex shank fits all standard power tools and impact drivers

Perfect for stainless steel, aluminum, copper sheets, and hardened plastics

Essential for HVAC, automotive repair, and electrical enclosure installations

Mirror-finish holes with zero burrs for professional fabrication results

Magnetic base compatible for vertical drilling in tight spaces

Includes shock-resistant storage case for jobsite organization

Backed by our global wholesale guarantee – bulk discounts available