Internal Hex, External Hex, Hex, TX, 6-Point
Imperial, Metric, AF, Torx, SAE
3/16 ", 5.5 mm, 9/16 ", 26 mm, 30 mm
1, 1-1/2, 1/2, 3/8, 2-1/2
38.1, 6.35, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide