External Hex, Internal Torx, Internal Hex, Hex, TX
Torx, AF, Metric, Imperial, SAE
5.5 mm, 13/16 ", 7/16 ", 13 mm, 11/16 "
1-1/2, 1/4, 2-1/2, 1/2, 3/4
38.1, 6.35, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate