Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
5.5 mm, 7/16 ", 35 mm, 23 mm, 25 mm
1/4, 1, 1-1/2, 3/4, 2-1/2
9.53, 25.4, 12.5, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide