External Hex, Internal Torx, Hex, TX, 6-Point
Imperial, AF, Torx, Metric, SAE
9/16 ", 3/16 ", 18 mm, 11/16 ", 25 mm
1, 1-1/2, 3/4, 2-1/2, 3/8
25.4, 6.35, 9.53, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide