Chrome vanadium steel. Metric and imperial long series hex keys. Includes 12 x long arm metric and 13 x long arm imperial wrenches. Metric sizes: 1.27, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 5.5, 6, 8 and 10mm. Imperial AF sizes: 1/20”, 1/16”, 5/64”, 3/32”, 7/64”, 1/8”, 5/32”, 3/16”, 7/32”, ¼”, 5/16” and 3/8”.