Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
12 mm, 9/16 ", 3/16 ", 5/8 ", 25 mm
1-1/2, 2-1/2, 3/4, 3/8, 1/2
25.4, 6.35, 12.5, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide