External Hex, Internal Torx, Internal Hex, TX, Hex
Metric, AF, Imperial, Torx, SAE
7/32 ", 8 mm, 7 mm, 9/16 ", 29 mm
1/4, 1/2, 3/4, 2-1/2, 3/8
9.53, 25.4, 12.5, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide