IRWIN 3016020 Jobber Drill Bit, 5/16 in Dia, 4-1/2 in OAL, Spiral Flute, 1-Flute, 5/16 in Dia Shank

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Product Code: 9788258

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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).