Deep Wall Drive? sockets manufactured from Chrome Vanadium steel. Electro-deposition manganese phosphate finish for added corrosion resistance. Suitable for use with impact wrenches. Contents: Sockets; 10, 12, 13, 15, 16, 17, 18, 19, 21, 22, 24, 27mm, Extensions; 125, 250mm, Universal Joint 1/2sq. Supplied in steel carry-case.