Features CARBON STEEL ZINC-PLATED: These coupling nuts are made from zinc-plated carbon steel for high strength and good corrosion resistance. HEXAGONAL SHAPE: The nuts are hexagonal in shape with 6 sides, making the angles accessible to the tool finer. GOOD FASTENING PERFORMANCE: The nuts are used to install bolts, studs or machine screws to fasten two parts together to make a whole. WIDE APPLICATION: These hexagon long rod nuts can be widely used in home and office, communication equipment, ship assembly and other mechanical industries. M8 WITH 4 SIZES: The nuts are available in M8*20, M8*28, M8*30, M8*40 for your choice to meet your different needs. Specification: Condition: 100% Brand New Material: Carbon steel Surface treatment: galvanized Quantity: 10pcs Type & Hex Size & Weight: #01 M8*20, 11mm, 88g/3.1oz; #02 M8*28, 10mm, 71g/2.5oz; #03 M8*30, 12mm, 167g/5.9oz; #04 M8*40, 12mm, 223g/7.9oz (Optional) Package List: 10 x Hex Nut Package List