External Hex, Internal Torx, Internal Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
7/8 ", 13 mm, 25 mm, 28 mm, 11/16 "
3/4, 2-1/2, 3/8, 1/4, 1/2
25.4, 38.1, 12.5, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide