The Grainger 141D41 is a Westward 3/8-inch drive impact socket adapter that converts a 3/8-inch drive to a 1/2-inch drive. It is made from chrome vanadium steel for durability and has a black phosphate finish to resist corrosion. This impact socket adapter allows you to use 3/8-inch drive tools with a 1/2-inch drive impact wrench, increasing versatility. It measures 2-1/2 inches long and weighs 0.19 lbs. The 141D41 socket adapter is ideal for automotive repair shops, fleet maintenance, and other heavy duty applications requiring high torque ratcheting and driving.