The Grainger 16N455 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 has a black oxide finish to resist corrosion. This socket adapter allows you to use 1/4-inch drive tools with 3/8-inch drive ratchets, extensions, universals, and more. It measures 1-1/2 inches long and weighs 0.8 ounces. The 16N455 socket adapter is ideal for automotive repair, machinery maintenance, and any application requiring conversion between 1/4-inch and 3/8-inch square drives.