Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, AF, Imperial, Metric, SAE
7/8 ", 16 mm, 5/16 ", 11/16 ", 1-1/2 "
3/4, 1, 3/8, 2-1/2, 1-1/2
19.05, 25.4, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate