Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
5 mm, 11/16 ", 33 mm, 25 mm, 1-1/2 "
1-1/2, 2-1/2, 1/4, 3/8, 1
25.4, 12.5, 9.53, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide