Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Torx, Metric, AF, SAE
15 mm, 5/16 ", 7/8 ", 5 mm, 11/16 "
38.1, 19.05, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide