Welcome to the store! Reliable Material: these washers are made of polypropylene, a plastic material, with good insulation, low profile, and good durability, making them easy to hold. Size Information: the plastic washers are about 45 mm/1.77 inches in diameter and the center hole is about 5 mm; Sufficient to Use: you will receive 200 washers for screws and nails, enough for your daily replacement and use in foam board insulation and other repairs. Fixing and Support: these plastic washers are designed to be used for fixing and supporting expanded polystyrene boards, extruded polystyrene, and many types of foam boards. Easy to Install: the round washer is easy to fix with a screw or nail, and you can also remove it easily; The extra washers can be stored for later use. Color: White Material: plastic Package Contents: 200 pcs x Plastic Insulation Washers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real one. The allowable measurement error is +/- 1-3 cm. Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!