Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
3/16 ", 5.5 mm, 9/16 ", 11/16 ", 11 mm
1, 2-1/2, 1-1/2, 1/2, 3/4
12.5, 6.35, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide