Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, Metric, SAE
5/16 ", 5.5 mm, 7/8 ", 3/16 ", 1-1/2 "
1, 2-1/2, 1-1/2, 1/2, 3/4
6.35, 38.1, 12.5, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide