Impact Socket, Socket Size 9/16 in, Socket Shape 6-Point, Drive Type Impact, Drive Size 1/4 in, Compatible Fastener Type Bolts, No, Alloy Steel, Black Oxide, Impact Rated Yes, Socket Depth Standard, Socket Length 1 31/32 in This 1/4" Drive SAE Impact Socket is ideal for use on stubborn or damaged fasteners, and on fasteners made from soft materials. The TorquePlus(TM) design helps provide quick and easy socket engagement to fastener flats (not corners). The radius-corner design shifts contact area and stress away from fastener corners, minimizing slippage.