The DeWalt 1/2" 6 pt Drive Deep Impact Socket 21MM (DWMT75111OSP) is designed for use with impact drive tools for a variety of fastening applications. This socket is built to last, with a heat treated steel construction and an oil-rubbed black oxide coating for added durability and corrosion resistance. It features laser-etched markings for easy identification of sizes and DirectTorque technology with a six-point configuration that helps prevent the rounding of fasteners under high torque applications.