Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Metric, AF, Torx, SAE
7/8 ", 5.5 mm, 10 mm, 25 mm, 1-1/2 "
1, 2-1/2, 1-1/2, 1/2, 3/8
6.35, 19.05, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide