Internal Hex, Internal Torx, Hex, TX, External Torx
Imperial, AF, Metric, Torx, SAE
5/16 ", 5/8 ", 7/8 ", 23 mm, 1-1/2 "
1/2, 1/4, 3/4, 3/8, 2-1/2
19.05, 25.4, 6.35, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide