Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
1/4 ", 3/4 ", 3/16 ", 5.5 mm, 7/16 "
1-1/2, 1, 2-1/2, 1/2, 3/4
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