Chrome vanadium steel wrenches are heat treated and black-oxide finished * Precisely-sized, chamfered ends insert smoothly into fastener head, reducing wear * 9-pc. Hex key wrenches (SAE): 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4 in. * 8-pc. Hex key wrenches (Metric) 1.5, 2, 2.5, 3, 4, 5, 6, 8 mm * 8-pc. Star key wrenches: T9, T10, T15, T20, T25, T27, T30, T40