Internal Hex, External Hex, Internal Torx, TX, Hex
Metric, AF, Torx, Imperial, SAE
11 mm, 5/16 ", 9 mm, 9/16 ", 28 mm
1-1/2, 3/4, 1, 2-1/2, 1/2
6.35, 19.05, 38.1, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide