Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
15 mm, 13/16 ", 5/8 ", 5 mm, 5/16 "
1/4, 1, 1-1/2, 2-1/2, 3/4
6.35, 9.53, 19.05, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide