The Faithfull Professional high quality, forged from chrome vanadium steel are hardened, tempered and satin chrome plated for corrosion protection. Manufactured to DIN 3113. Broached jaws and rings to ensure a consistent tolerance and a guaranteed accurate fit. Both the jaw and ring end are set at a 15 degree offset for ease of use in awkward positions. Contents: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,24,25,26,27,28, 30 and 32mm.