Be ready for anything with the TEKTON 1/2 in. Drive (F) to 3/8 in. Drive (M) Impact Reducer. Engineered for use with impact drivers, this problem solver gives you more options for dealing with the unexpected. It 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 chrome vanadium steel, it is precisely heat treated for superior strength and protected by a corrosion-resistant black oxide finish.