Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, Imperial, AF, SAE, Metric
4.5 mm, 9 mm, 7/8 ", 5.5 mm, 9/16 "
1, 1-1/2, 3/8, 2-1/2, 1/2
6.35, 9.53, 25.4, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide