External Hex, Internal Torx, Internal Hex, TX, Hex
Imperial, AF, Torx, SAE, Metric
11/16 ", 8 mm, 12 mm, 5/8 ", 1-1/2 "
1, 1-1/2, 1/4, 3/8, 2-1/2
9.53, 38.1, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide