Stanley J10013SS Proto 1-inch Drive Impact Socket 13/16-inch - 4 Point Drive end chamfer and four detents help provide quick positive engagement with drive tool on any of the socket drive walls. Tight tolerances for snug fit on fastener. Large clearance holes, concentric opening and nut end chamfer make it easy to position socket on fasteners. Made from high-strength steel to help minimize wall thickness and provide access to fasteners in recesses and where nuts and bolts protrude. Impact sockets are used wherever powered drive tools are used to install or remove fasteners.