Internal Torx, External Hex, Internal Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
7/8 ", 9/16 ", 16 mm, 1/2 ", 23 mm
1, 2-1/2, 1-1/2, 3/8, 3/4
25.4, 6.35, 12.5, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide