Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Metric, Imperial, SAE
9 mm, 5/16 ", 9/16 ", 23 mm, 10 mm
19.05, 38.1, 25.4, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate