Reliable Material: These washers are made of polypropylene, a plastic material, featuring good insulation, low profile, and durability, which are easy to handle Size Information: The plastic washers are about 45 mm (1.77 inches) in diameter, with a center hole of approximately 5 mm Sufficient Quantity: You will receive 200 washers suitable for screws and nails, providing ample supply for daily use, replacements, foam board insulation, and various repair tasks Fixing and Supporting: These plastic washers are designed for securing and supporting expanded polystyrene sheets, extruded polystyrene, and various types of foam boards Easy to Install: The round washers can be easily attached with screws or nails and removed when needed; Extra washers can be stored for future use Color: White Material: Plastic Package Contents: 200 x Plastic Insulation Washers Note: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm