Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
5/16 ", 9/16 ", 5 mm, 11/16 ", 23 mm
1/2, 3/4, 1, 2-1/2, 1-1/2
25.4, 38.1, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide