Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Metric, Imperial, Torx, SAE
7/32 ", 5.5 mm, 15/16 ", 5/16 ", 3/16 "
1/2, 1/4, 3/4, 1-1/2, 2-1/2
12.5, 6.35, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide