External Torx, Internal Torx, External Hex, Hex, TX
Imperial, Torx, Metric, AF, SAE
7/8 ", 13 mm, 5.5 mm, 9/16 ", 11/16 "
1, 1-1/2, 3/4, 2-1/2, 1/2
25.4, 38.1, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide