Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Imperial, AF, Torx, SAE
9/32 ", 15 mm, 9/16 ", 5.5 mm, 5/8 "
3/4, 1, 1-1/2, 2-1/2, 3/8
9.53, 6.35, 25.4, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide