Stanley Proto J7018MHT 3/8-Inch Drive Thin Wall Deep Impact Socket, 18mm, 6 Point Specifically designed for light clearance applications Reduced wall thickness helps improve access to fasteners in restricted areas All Impact sockets feature one through hole and a groove to accept a retaining ring and pin to secure the socket to the power tool anvil Chamfered service ends for quick and positive fastener engagement Proto 6 Point Impact Sockets are ideal for use on stubborn or damaged fasteners, and also on fasteners made from soft materials