Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
5/8 ", 3/16 ", 9/16 ", 28 mm, 1-1/2 "
1-1/2, 1, 3/4, 2-1/2, 1/2
19.05, 12.5, 6.35, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide