Internal Torx, Internal Hex, External Hex, TX, Hex
Metric, Imperial, Torx, AF, SAE
5/16 ", 7/8 ", 5 mm, 11/16 ", 1-1/2 "
1-1/2, 3/4, 1, 2-1/2, 1/2
6.35, 19.05, 9.53, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide