Northern Industrial Tools (Step Shank) Drill Bit Set 1/2in. Dia.
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Manufacturer:
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Northern Tool And Equipment
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Model Number:
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15134
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"S & D (step) shanks fit 1/2in. drill. Bit sizes: 17/32, 9/16, 19/32, 5/8, 21/32, 11/16, 23/32, 3/4, 13/16, 7/8, 15/16 and 1in.."