Features • Fits all Williams 3/4" Drive Sockets and Accessories • Crush Gage on the resin pin indicates when a socket is excessively worn and should be replaced. • Securely retains sockets and accessories to square drive of impact wrench • For 3/4" drive impact tools with pin retention hole and groove • Made of oil resistant material • RET RING® is a trademark of FTL Enterprises, Inc.