Internal Hex, External Hex, Internal Torx, TX, Hex
AF, Torx, Imperial, SAE, Metric
3/16 ", 9 mm, 32 mm, 1-1/2 ", 11/16 "
1/2, 1-1/2, 3/4, 2-1/2, 3/8
25.4, 6.35, 38.1, 19.05, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide