TEKTON 47820 1/2-Inch Drive (F) to 3/8-Inch Drive (M) Impact Reducer, Cr-V Engineered for use with impact drivers Multiplies the range and capability of your socket system Spring-loaded detent ball securely latches onto sockets, preventing them from being dropped Through-hole in drive end locks onto drive tang Made of premium chrome vanadium steel with a protective black oxide finish