Internal Hex, External Hex, TX, Hex, External Torx
Imperial, Torx, AF, Metric, SAE
5/16 ", 7/16 ", 3/16 ", 9/16 ", 11/16 "
1, 3/4, 2-1/2, 1-1/2, 1/2
38.1, 25.4, 6.35, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide