Our stainless steel 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 long-lasting durability. Simply place the washer over the fastener and tighten to secure the board in place. Features -Color:Silver -Material:Stainless steel -Size:3.50X3.50X0.30cm/1.38X1.38X0.12in - Inner diameter: 0.58cm; Outer diameter 3.5cm -Durability: these stainless steel 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 high health 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 solutionsPackage list: 100 x gypsum board washer