Internal Torx, External Hex, TX, Hex, External Torx
Imperial, AF, Metric, Torx, SAE
13/16 ", 7/8 ", 5 mm, 3/16 ", 5.5 mm
3/8, 1-1/2, 2-1/2, 1/2, 3/4
38.1, 6.35, 12.5, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide