Professional Quality, forged from chrome vanadium steel hardened, tempered and chrome plated for corrosion protection. Polished bi - hexagon ring and jaw offset at 15. 10 x Spanners: 8, 9, 10, 11, 12, 13, 14, 17, 19, 22mm Manufactured to DIN 3113 Form B/ISO 3318 Specifications.