Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Metric, Imperial, Torx, SAE
7 mm, 7/16 ", 5/16 ", 5/8 ", 1-1/2 "
1/4, 2-1/2, 3/4, 1/2, 3/8
19.05, 38.1, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide