Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Metric, Imperial, SAE
5 mm, 7/32 ", 4.5 mm, 9/32 ", 9 mm
1/2, 1-1/2, 3/4, 1, 2-1/2
25.4, 12.5, 19.05, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide