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.. Includes (qty.): 12, Shank Diameter (in.): 1/2, Size: 17/32, 9/16, 19/32, 5/8, 21/32, 11/16, 23/32, 3/4, 13/16, 7/8, 15/16
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