This is an eighteen piece accessory set for impact drive tools, designed for strength and durability. The set includes a variety of extension bars, socket adaptors, bit adaptors, and universal joints. Made from chromium-vanadium steel, it offers resistance to abrasion, oxidation, and corrosion, with a black phosphate finish for added protection. The set is supplied in a convenient storage case. Set Contents: 1/4" Drive impact extension bars: 3" and 6" 3/8" Drive impact extension bars: 3", 6" and 10" 1/2" Drive impact extension bars: 3", 6" and 10" Impact socket adaptors: 1/4" F x 3/8" M, 3/8" F x 1/4" M, 1/2" F x 3/8" M, 3/8" F x 1/2" M Impact universal joint: 1/4" Drive, 3/8" Drive and 1/2" Drive Impact bit adaptors: 1/4" Hex x 1/4" Drive, 1/4" Hex x 3/8" Drive and 5/16" Hex x 1/2" Drive.