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Irwin 3016015 15/64" X 3-7/8" Cobalt Drill Bit
High speed steel with M-35, five percent 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)