External Hex, Internal Hex, Internal Torx, TX, Hex
Imperial, Metric, AF, Torx, SAE
9 mm, 11/16 ", 15/16 ", 9/16 ", 5/8 "
1/4, 1-1/2, 2-1/2, 1/2, 3/4
38.1, 19.05, 6.35, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide