Features: Made of zinc plated carbon steel material, high strength and good corrosion resistance. Hexagonal shape has 6 sides that gives a good granularity of angles for a tool to approach from. These hex nuts will be great replacement for industrial and construction fasteners. Used to fit bolts, studs or machine screws for fastening two parts together to make them one piece. Widely used in the home and office appliance, communication equipment, ship assembly and other machinery industry. 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