Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, SAE, Metric
9/16 ", 19 mm, 7/16 ", 5/8 ", 11/16 "
1, 1-1/2, 2-1/2, 1/4, 1/2
38.1, 6.35, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide