External Hex, Internal Hex, Internal Torx, Hex, TX
AF, Torx, Imperial, SAE, Metric
15/16 ", 5 mm, 14 mm, 11/16 ", 1-1/2 "
3/4, 2-1/2, 1, 1-1/2, 1/2
38.1, 25.4, 19.05, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide