IRWIN 3016021 Jobber Drill Bit, 21/64 in Dia, 4-5/8 in OAL, Spiral Flute, 1-Flute, 21/64 in Dia Shank

High-speed steel with M-35, 5% cobalt, for higher heat and abrasion resistance; heavy-duty web construction for strength and durability. Split point begins drilling immediately, minimizing bit walk when used in applications such as metal drilling, including heavy-duty abrasive alloy metal drilling on hardened steel (heat-treated).