External Torx, Internal Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
7/32 ", 9/32 ", 3/16 ", 4.5 mm, 5/8 "
2-1/2, 1-1/2, 1/2, 3/8, 3/4
38.1, 19.05, 12.5, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide