IRWIN 3016032 Jobber Drill Bit, Spiral Flute, 2-1/8 in L Flute, Reduced Shank, 1/2 in Dia x 1-1/8 in L Shank                    5% cobalt and heavy-duty web construction for higher heat and abrasion resistance, strength and durability. Split point begins drilling immediately, minimizing bit walk in applications such as heavy-duty abrasive alloy metal drilling on hardened steel. Jobber length.