Internal Hex, Internal Torx, Hex, TX, External Torx
Metric, Imperial, AF, Torx, SAE
9/16 ", 5.5 mm, 7/16 ", 25 mm, 35 mm
1, 1-1/2, 2-1/2, 3/8, 1/2
6.35, 25.4, 12.5, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide