The Grainger 14R045 is a Westward 3/8-inch drive deep impact socket set. This 15-piece set includes sizes from 4mm to 14mm, offering a variety of metric socket sizes for impact wrench applications. Made from chrome vanadium steel with a black phosphate finish, these sockets resist corrosion. Designed for use with pneumatic impact tools up to 1,100 ft-lbs of torque, the set comes in a molded case for storage and organization. Ideal for automotive and machinery repair, this Westward set is suited for high torque hand tools.