Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, AF, Imperial, Torx, SAE
5 mm, 9/32 ", 5.5 mm, 5/16 ", 1-1/2 "
1/2, 3/4, 1-1/2, 2-1/2, 1
9.53, 19.05, 38.1, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide