Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Metric, Imperial, SAE
5/16 ", 5/8 ", 7/8 ", 7 mm, 11/16 "
38.1, 6.35, 19.05, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide