Reliable Material: These washers are made of polypropylene, a plastic material featuring good insulation, low profile, and durability. They are easy to handle. Size Information: The plastic washers are approximately 45 mm (1.77 inches) in diameter, with a center hole of about 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 multiple 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 display differences may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.