Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Imperial, AF, Torx, SAE
7/8 ", 9/16 ", 5/16 ", 7/16 ", 11/16 "
38.1, 9.53, 6.35, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide