Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Imperial, Torx, AF, SAE
7/32 ", 7/16 ", 5/16 ", 1/2 ", 9 mm
1, 3/4, 1/4, 2-1/2, 1-1/2
25.4, 19.05, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide