External Hex, External Torx, Internal Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
7/16 ", 13/16 ", 1/4 ", 30 mm, 11/16 "
1, 3/4, 1-1/2, 2-1/2, 3/8
38.1, 6.35, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide