Internal Hex, External Hex, Internal Torx, TX, Hex
AF, Metric, Torx, Imperial, SAE
9/16 ", 3/16 ", 5/16 ", 25 mm, 29 mm
38.1, 25.4, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide