External Hex, Internal Hex, TX, Hex, External Torx
Imperial, AF, Torx, SAE, Metric
9/32 ", 11 mm, 5/16 ", 5 mm, 7/16 "
1-1/2, 1/4, 3/4, 2-1/2, 1/2
25.4, 19.05, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide