Forged from chrome vanadium steel, more wear resistant than carbon steel. Millimetre, With ratchet system that allows the key to be kept firm, providing greater speed and control on the job, Reduces wear on hardware., With mirror polished finish for easy cleaning, Stamped measurements for easy product identification, Ideal for working in tight spaces, For tightening or loosening nuts, screws and other fasteners. Sizes: 8, 10, 12, 13, 14, 15, 16, 17mm