Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
3/16 ", 18 mm, 7/16 ", 5/8 ", 11/16 "
1/4, 1-1/2, 3/4, 1, 2-1/2
38.1, 9.53, 19.05, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide