Impact Socket, Socket Size 1/4 in, Socket Shape 6-Point, Drive Type Impact, Drive Size 3/8 in, Compatible Fastener Type Bolts, No, Alloy Steel, Black Oxide, Impact Rated Yes, Socket Depth Standard, Socket Length 1 3/16 in This 3/8" Drive SAE Impact Socket is ideal for use on stubborn or damaged fasteners, and on fasteners made from soft materials. The TorquePlus(TM) drive configuration uses a radius-corner design that shifts contact area and stress away from the fastener corners and distributes contact stresses over a large area of the socket, minimizing slippage. The internal design helps minimize fastener rounding and allows the user to easily turn worn, rounded, or rusted fasteners.