The Grainger 141H76 is a Westward brand 1/4-inch drive socket adapter that converts a 1/4-inch square drive to a 3/8-inch square drive. It is made from chrome vanadium steel for durability and allows users to attach 1/4-inch drive tools to larger 3/8-inch drive ratchets or extensions. This socket adapter measures 1-1/2 inches long and has a black oxide finish to resist corrosion. It is rated up to 20,000 psi working torque.