Internal Torx, External Hex, TX, Hex, External Torx
Imperial, Metric, Torx, AF, SAE
5/16 ", 7/16 ", 11/16 ", 33 mm, 1-1/2 "
3/4, 2-1/2, 1-1/2, 1/2, 3/8
9.53, 38.1, 19.05, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide