Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
11/16 ", 5/16 ", 3/16 ", 7/16 ", 23 mm
1/4, 1, 1-1/2, 2-1/2, 3/8
6.35, 19.05, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide