Easy to Install: The 1-1/8 inch board washers with screws have a groove in the middle with drive screws and a convex back for inserting into the of the backing board to play a fixed role, which can be easily done by one person. Practicality: These foam board fasteners are the perfect fasteners kit for fixing and installing foam boards, backing boards, etc. They are efficient and practical and bring a lot of convenience to your . Robust Materials: The foam board fasteners are made of high quality steel, with rust-proof galvanized outer , strong, not easily deformed or rusted, . Abundant Quantity: The package contains a total of 600pcs galvanized steel foam board fasteners with the diameter of about 1-1/8 inches, 600pcs screws. Sufficient quantity to meet the needs of daily use and replacement. Wide Usages: These foam board washers are suitable for a variety of installations, including home decoration, schools, hotels and other infrastructure installations, saving time and effort., Manufacturer: Jnchdghwa