External Hex, Internal Hex, TX, Hex, External Torx
AF, Metric, Imperial, Torx, SAE
5/16 ", 15/16 ", 3/8 ", 9/16 ", 23 mm
1, 1-1/2, 3/4, 1/4, 2-1/2
38.1, 25.4, 9.53, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide