DeWALT HSS-CO Extreme Cobalt Drill for metal 3.5X70MM

Faster drilling. Up to 4 times faster than standard HSS-R drill set. Increased durability. Up to 50% stronger than the standard HSS-R drill set. Cleaner, more accurate holes without burrs, thanks to the spiral design. Innovative tapered shape greatly reduces breakage. Non-slip shank with 3 flat sides prevents slipping in the chuck (for diameters 0.197 and larger only). Ferrous gold oxide coating prevents overheating and prolongs the life of the drill bit. High speed choke alloy with 5% cobalt steel for high temperature stability when drilling in hard materials.