Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
3/16 ", 16 mm, 5/16 ", 11/16 ", 1-1/2 "
1/2, 3/4, 1/4, 1-1/2, 2-1/2
25.4, 19.05, 12.5, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide