External Hex, Internal Hex, Internal Torx, TX, Hex
Torx, Metric, AF, Imperial, SAE
5.5 mm, 13/16 ", 3/16 ", 18 mm, 1-1/2 "
1-1/2, 1/4, 3/4, 2-1/2, 1/2
25.4, 6.35, 9.53, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide