Internal Hex, External Hex, Hex, TX, 6-Point
Imperial, AF, Metric, Torx, SAE
3/16 ", 5/16 ", 7/16 ", 11/16 ", 33 mm
3/4, 2-1/2, 1-1/2, 1/2, 3/8
38.1, 19.05, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide