Our flat washers for insulation boards are crafted from robust galvanized iron, ensuring they can withstand the rigors of any construction project. These washers are ideal for use with gypsum boards, providing a secure hold that prevents movement and ensures a smooth, even surface. To install, simply place the washer over the fastener and tighten. These washers are suitable for background wall installations and other insulation projects. Features -Color:Silver -Material:Galvanized iron -Size:3.50X3.50X0.30cm/1.38X1.38X0.12in - Inner diameter: 0.58cm; Outer diameter 3.5cm -Healthconscious: these washers are keep from harmful substances, making them suitable for environments with strict health requirements, such as children's rooms and medical facilities -Galvanized iron construction: made from robust galvanized iron, these washers are built to last and resist deformation, even in humid conditions like kitchens and bathrooms -Easy installation: no professional skills are needed to install these washers, making them a convenient choice for diy enthusiasts looking to save time and effort -Reliable performance: designed to keep wall decoration materials securely in place, these washers help prevent the common issue of materials falling off -Aesthetic flexibility: these washers offer a solution to the design options of traditional wall decorations, catering to users who desire unique and unique decor Package list: 200 x gypsum board washer