Our insulation board fixing nails with washer can be used for fixing a wide range of materials on ceiling or wall, including insulation boards, foam panels, sheets.SpecificationMaterial: Aluminum, galvanized ironWidth: 50mm / 2 inchNail Length: 80mm / 3.15 inchWasher Diameter: 30mm / 1.18 inchAdvantageThe base/washer is made of galvanized iron and the nails are made of aluminum.Metal point make the nail easy to insert into different materials insulation board and the washers can help you fix the insulation board in position better.Instruction1. Use some adhesive or glue on the aluminum base and put it on the wall.2. When the adhesive is dry, get through the insulation board with the nail.3. Finally, place the washer on top,and bend the nail to make sure it's secure.Note:Please check the sizing and compatibility before purchasing.