External Hex, Internal Hex, Internal Torx, Hex, TX
AF, Torx, Metric, Imperial, SAE
4.5 mm, 5.5 mm, 9/32 ", 7/16 ", 11/16 "
1, 3/4, 1/4, 1-1/2, 2-1/2
19.05, 38.1, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide