Internal Torx, External Torx, External Hex, Hex, TX
Metric, AF, Imperial, SAE, Torx
7/32 ", 9/32 ", 5.5 mm, 15 mm, 5/16 "
1/4, 1-1/2, 3/4, 2-1/2, 1/2
12.5, 38.1, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide