Internal Torx, Internal Hex, External Hex, TX, Hex
Metric, Imperial, AF, Torx, SAE
5/16 ", 7/32 ", 7/16 ", 17 mm, 1-1/2 "
12.5, 19.05, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide