These are the replacement drill bits for our orginal high speed steel 7-piece countersink set # 357-0023 with rounded shanks. Bits are designed to follow the taper of screws to give you a good tight fit. Countersinks ensure a flush fit. For screw sizes #5, 6, 7, 8, 9, 10 and 12.

Drill sizes: 1/8", 9/64", 5/32", 11/64", 3/16", 13/64" and 7/32".

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