SK Hand Tools 385 1/4-Inch Female and 3/8-Inch Male Adapter 1/4-inch(F) to 3/8-inch(M) chrome adapter, made in the United States Patented SuperKrome finish for durability and maximum corrosion resistance Allows greater flexibility for all your sockets and drive tools Steel ball is spring-loaded for easy use Adapter measures 1/4-inchF - 3/8-inchM