Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Imperial, Metric, SAE
5.5 mm, 15/16 ", 5/16 ", 30 mm, 1-1/2 "
1, 3/4, 1-1/2, 2-1/2, 3/8
9.53, 6.35, 19.05, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide