External Hex, Internal Torx, Internal Hex, Hex, TX
Imperial, AF, Torx, Metric, SAE
4.5 mm, 7/32 ", 7/16 ", 7/8 ", 5.5 mm
1-1/2, 3/4, 2-1/2, 1/2, 3/8
38.1, 12.5, 6.35, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide