Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, Imperial, AF, SAE, Metric
5/16 ", 7/8 ", 3/16 ", 10 mm, 11/16 "
3/4, 1, 2-1/2, 1/2, 1-1/2
12.5, 25.4, 38.1, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide