Internal Torx, External Hex, Internal Hex, TX, Hex
AF, Metric, Torx, Imperial, SAE
3/16 ", 5/16 ", 11/16 ", 35 mm, 25 mm
1/4, 2-1/2, 3/8, 1/2, 3/4
6.35, 9.53, 12.5, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate