Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, Metric, SAE
15/16 ", 5/8 ", 7/8 ", 5 mm, 15 mm
1-1/2, 1/2, 3/4, 2-1/2, 3/8
9.53, 19.05, 25.4, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide