Internal Torx, External Hex, TX, Hex, External Torx
Imperial, AF, Torx, Metric, SAE
4.5 mm, 7/32 ", 9/32 ", 5.5 mm, 1/4 "
3/4, 1, 1-1/2, 2-1/2, 3/8
25.4, 38.1, 9.53, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide