Internal Hex, External Torx, Internal Torx, TX, Hex
Metric, Imperial, Torx, AF, SAE
4 mm, 5.5 mm, 7/32 ", 9/32 ", 11/16 "
1-1/2, 3/4, 1, 2-1/2, 1/2
6.35, 19.05, 12.5, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate