Internal Hex, Internal Torx, Hex, TX, External Torx
Imperial, Torx, AF, SAE, Metric
5/16 ", 7/8 ", 5.5 mm, 9/16 ", 25 mm
1-1/2, 1, 2-1/2, 3/8, 1/2
9.53, 12.5, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide