5/16 Threaded Shank Counterbore • HSS • Used to enlarge the opening of a hole to allow room for the head of a fastener List Number MC27020 Substrate HSS Package Quantity 1 Shank 3/8 Length 3-1/4 Flute Count 2 Bolt 5/16 Pilot Diameter 11/32 Pilot Length 3/8 Cut Length 5/8 Diameter 15/32 SKU: MC27020 Category: Counterbores Related products LGS10-2 Weldon Tu-Lip Conterbore Item #: CW90302 LGN4-1 Weldon Tu-Lip Conterbore Item #: CW90041 LGS12-1 Weldon Tu-Lip Conterbore Item #: CW90321