Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Imperial, SAE, Metric
11/16 ", 7/8 ", 5 mm, 3/16 ", 28 mm
1-1/2, 3/4, 1/4, 2-1/2, 3/8
12.5, 9.53, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide