Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, AF, Imperial, SAE, Metric
9 mm, 5/16 ", 3/8 ", 5/8 ", 11/16 "
3/4, 1, 2-1/2, 1-1/2, 3/8
6.35, 9.53, 25.4, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide