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






























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Good quality Hss cobalt spiral step drill bit set for power tool
$50$62.54-20.05%
Material:
M2
HIGH SPEED STEEL
M35
HSS4341
HSS4241
Diameter:
2.0mm
2.5mm
3MM
10MM
3-12MM
3.5mm
8mm
7MM
4-20MM
6.5mm
5.5mm
4mm
5MM
4-12MM
6MM
7.5mm
4.5mm
Quantity:
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