Internal Hex, External Hex, Hex, TX, 6-Point
Imperial, Torx, AF, Metric, SAE
7/8 ", 8 mm, 23 mm, 34 mm, 36 mm
1-1/2, 1, 2-1/2, 3/8, 3/4
38.1, 19.05, 9.53, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide