【carbon steel】Nuts are made of carbon steel with zinc plated surface which can offer high strength and good corrosion resistance. 【fasten tightly】Fastening two parts together to make them one piece, can be used for bolts, studs or machine screws. 【M8】Nuts are in standard M8 thread which will be easy and convenient to use,6 sides will be easy for tools to hold. 【wide applications】These hex long rod nuts can be widely used for the home and office, communication equipment, ship assembly and other machinery industry. Note: It does not include other things, the color is based on the first picture, and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thanks!