Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
9/32 ", 9/16 ", 5/16 ", 7/16 ", 25 mm
1, 1-1/2, 1/4, 1/2, 2-1/2
38.1, 19.05, 6.35, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide