Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
5.5 mm, 11/16 ", 23 mm, 28 mm, 1-1/2 "
1/4, 1-1/2, 1, 2-1/2, 3/8
25.4, 9.53, 6.35, 19.05, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide