Internal Torx, External Hex, Internal Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
12 mm, 3/16 ", 9 mm, 7/16 ", 11/16 "
1/2, 3/8, 3/4, 1-1/2, 2-1/2
12.5, 19.05, 6.35, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide