These Faithfull professional, high quality Combination Spanners are forged from chrome vanadium steel, which is hardened, tempered and satin chrome plated for corrosion protection. Manufactured to DIN 3113 standards. The broached jaws and rings 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. Ref: UTTK12692