Internal Hex, External Torx, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
13/16 ", 5/8 ", 19 mm, 5/16 ", 1-1/2 "
1, 1-1/2, 3/4, 2-1/2, 1/2
25.4, 6.35, 19.05, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide