External Torx, Internal Torx, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
9/16 ", 5.5 mm, 12 mm, 5/8 ", 11/16 "
1/2, 3/4, 2-1/2, 1-1/2, 3/8
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