Tough metal drilling, made for drilling into hardened steel bolts for creating pilot holes for screw extractors, 8% Cobalt alloyed for higher heat and abrasion resistance, Shorter drill for additional strength, Heavy-duty web construction for strength and durability, Cutting Diam: 7/16 in, Flute Length: 2-5/8 in, Overall Length: 5-1/2 in, Cutting Edge Material: HSS-E (Co-M42), Finish: Gold Oxide, No, of Flutes: 2, Point Angle: 135, Point Shape: Split Point, Shank Type: Cylinder, Spiral Angle: CCW, Structure: Solid, Type: HSS Drill Bit, Hazmat: No, SKU: EGLT16567