When working with board insulation, our galvanized iron washers are the suitable choice for ensuring a secure and stable installation. These washers are designed to provide a firm grip, preventing the boards from shifting and ensuring a smooth, even surface. To use, position the washer over the fastener and tighten. These washers are ideal for both residential and commercial applications, offering durability. Features -Color:Silver -Material:Galvanized iron -Size:3.50X3.50X0.30cm/1.38X1.38X0.12in - Inner diameter: 0.58cm; Outer diameter 3.5cm -Safe materials: these washers are made without harmful substances, making them suitable for use in environments with standards, such as children's rooms and medical facilities -High durability: constructed from galvanized iron, these washers are built to last and resist deformation, even in moist environments like kitchens and bathrooms -Easy to install: designed for simple installation, these washers do not require professional construction skills, saving time and effort for diy enthusiasts -Stable and secure: these washers effectively prevent wall decoration materials from falling off, providing a reliable solution for home and office decor -DIY options: these washers offer a solution to the design options of traditional wall decorations, catering to users who desire unique and unique decor Package list: 100 x gypsum board washer