Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
7/32 ", 5.5 mm, 5/8 ", 5/16 ", 28 mm
2-1/2, 1-1/2, 3/8, 1/2, 3/4
38.1, 9.53, 12.5, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide