Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
5/8 ", 9/16 ", 7 mm, 5/16 ", 26 mm
19.05, 6.35, 25.4, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate