Internal Hex, External Hex, TX, Hex, External Torx
Imperial, Metric, Torx, AF, SAE
5/16 ", 11 mm, 5/8 ", 9/16 ", 9 mm
2-1/2, 1-1/2, 1/2, 3/8, 1
38.1, 6.35, 9.53, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide