Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Metric, Imperial, Torx, SAE
4 mm, 3/8 ", 7/16 ", 5/8 ", 34 mm
1, 1-1/2, 1/4, 2-1/2, 3/8
9.53, 12.5, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate