Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Metric, Torx, AF, SAE
5/16 ", 5/8 ", 11/16 ", 34 mm, 1-1/2 "
1, 2-1/2, 1-1/2, 3/4, 3/8
38.1, 19.05, 9.53, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide