Capri Tools high performance sockets are trusted by professionals for even the most demanding applications. We use premium Chrome Molybdenum steel tempered with our proprietary heat treatment process to make these impact sockets. They are durable and specifically made to withstand high torque from power tools. Each socket is expertly coated with manganese phosphate, the preferred coating in military and aerospace, which offers superior protection and corrosion resistance compared to black oxide coating on other impact sockets. The 6-point WaveDrive design grips fasteners more tightly than traditional design, preventing fastener rounding and giving you more leverage. Single shallow length, 3/8 in. drive, 7/16 in. size socket.