The TEKTON 1/2 Inch Drive (F) x 3/8 Inch (M) Impact Reducer creates a solution for lost or broken sockets, fills the gaps in incomplete size ranges, and extends the capability of your existing socket system. Made from premium 8660 Ni-Cr-Mo steel, it is precisely heat treated for superior strength and protected by a corrosion-resistant manganese phosphate finish. Its spring-loaded detent ball securely latches onto sockets, preventing them from being dropped or left stuck on fasteners.