Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
7/16 ", 9/16 ", 3/16 ", 18 mm, 5/16 "
1, 1-1/2, 2-1/2, 1/2, 3/8
6.35, 9.53, 12.5, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide