Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Torx, SAE, Metric
5/16 ", 13 mm, 7/16 ", 5/8 ", 1-1/2 "
38.1, 19.05, 12.5, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide