M20 Threaded Shank Counterbore • HSS • Used to enlarge the opening of a hole to allow room for the head of a fastener List Number MC27520 Substrate HSS Package Quantity 1 Shank 25.0 Length 149.0 Flute Count 2 Bolt M20 Pilot Diameter 21.0 Pilot Length 21.5 Cut Length 44.5 Diameter 33.0 SKU: MC27520 Category: Counterbores Related products LGN10-2 Weldon Tu-Lip Conterbore Item #: CW90102 LGN6-1 Weldon Tu-Lip Conterbore Item #: CW90061 LGS14-1 Weldon Tu-Lip Conterbore Item #: CW90341