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