Internal Torx, Internal Hex, External Hex, Hex, TX
Metric, AF, Torx, Imperial, SAE
7/16 ", 8 mm, 13/16 ", 5/8 ", 11/16 "
1/4, 1-1/2, 2-1/2, 1, 3/8
9.53, 19.05, 12.5, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide