Internal Hex, External Torx, External Hex, TX, Hex
AF, Torx, Metric, Imperial, SAE
13/16 ", 9/16 ", 5 mm, 3/16 ", 25 mm
12.5, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide