Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, SAE, Metric
3/16 ", 5/16 ", 11/16 ", 35 mm, 25 mm
1-1/2, 3/4, 1/2, 2-1/2, 3/8
12.5, 6.35, 9.53, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate