Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Imperial, Metric, SAE
7/32 ", 9/32 ", 6 mm, 9/16 ", 3/16 "
1-1/2, 1/4, 2-1/2, 1, 3/8
25.4, 19.05, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide