Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
7/8 ", 5.5 mm, 9 mm, 15 mm, 9/16 "
1/2, 1-1/2, 2-1/2, 1/4, 3/4
12.5, 19.05, 9.53, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide