Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, Torx, AF, SAE
3/16 ", 5.5 mm, 5/16 ", 5/8 ", 9/16 "
1, 1-1/2, 1/4, 3/8, 2-1/2
9.53, 6.35, 19.05, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide