Internal Torx, External Hex, Internal Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
5/16 ", 15 mm, 5.5 mm, 7/16 ", 15/16 "
38.1, 6.35, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide