External Hex, Internal Hex, Internal Torx, TX, Hex
AF, Imperial, Torx, Metric, SAE
5/8 ", 11/16 ", 35 mm, 36 mm, 23 mm
1, 1-1/2, 3/8, 2-1/2, 1/2
19.05, 9.53, 6.35, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide