Package Content: You will receive 100 pieces of plastic washers for screws and nails, enough for your daily use. Product Size: The diameter of these plastic washers is 45mm, and the hole in the middle is about 5mm. Product Material: Our flat washers are made of polypropylene material, cold and heat resistant, strong bearing capacity, good shock absorption effect, not easy to deform, good insulation and durable. Easy to Use: The round foam board washers are easy to fix with screws or nails, easy to install and easy to disassemble, and not easy to deform after loading. Wide Usage: These polypropylene washers are suitable for foam board, EPS board, extruded polystyrene, foam insulation board, with good support and fixing effect. Note:Due to the difference between different monitors, there may be slight color difference.