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™ 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. This listing is for each.