Description
Master mechanic, 7/16″ x 5-1/2″, high speed steel, black oxide drill bit, 135 split point, jobber length, 3/8″ shank, 135 point angle with 4 cutting edges which eliminate walking & provide fast penetration, black oxide tempering treatment reduces frictional resistance & improves chip flow, recommended for wood, plastic, wallboard, plywood & soft metals, aluminum, brass & bronze, for occasional use in stainless steel & other hard metals.
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