Our galvanized iron insulating board washers are suitable for securing gypsum boards, and other insulation materials. These washers provide a firm grip and prevent the boards from shifting, ensuring a stable installation. Ideal for use in constructing background walls, these washers are easy to install and offer durability. Simply place the washer over the fastener and tighten to secure the board in place. Features -Color:Silver -Material:Galvanized iron -Size:3.50X3.50X0.30cm/1.38X1.38X0.12in - Inner diameter: 0.58cm; Outer diameter 3.5cm -Durability: these galvanized iron insulating board washers are designed to withstand longterm use without deforming, making them ideal for humid environments like kitchens and bathrooms -Ease of use: simple and easy to install, these washers do not require professional construction skills, saving you time and effort, suitable for diy enthusiasts -Health safety: keep from harmful substances, these washers are safe for use in children's rooms, medical facilities, and other environments with standards -Secure fit: the washers are engineered to prevent wall decoration materials from falling off easily, providing a secure fit for various applications in homes and offices -Versatility: these washers solve the problem of monotonous wall decoration designs, making them suitable for users seeking unique and unique decor solutions Package list: 500 x gypsum board washer