Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
5.5 mm, 15/16 ", 13/16 ", 7/16 ", 34 mm
3/4, 1-1/2, 2-1/2, 1/2, 3/8
19.05, 25.4, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate