Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, AF, Imperial, SAE, Metric
7/8 ", 5.5 mm, 5/16 ", 11/16 ", 10 mm
3/4, 1-1/2, 2-1/2, 3/8, 1
6.35, 25.4, 19.05, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide