Internal Hex, External Hex, Internal Torx, Hex, TX
AF, Imperial, Torx, SAE, Metric
9 mm, 18 mm, 3/8 ", 11 mm, 33 mm
3/4, 1-1/2, 2-1/2, 1/2, 1
25.4, 9.53, 38.1, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide