Our expansion tube bolts with steel nails can be used for fixing a wide range of materials on ceiling or wall, including insulation boards, foam panels, sheets, and other materials that require load spreading during installation.SpecificationColor: WhiteMaterial: Plastic, SteelDiameter: 8mm / 0.32 inchMax Diameter: 60mm / 2.4 inchNail Length: 134mm / 5.3 inchTotal Length: 142mm / 5.6 inchPacking List: 30 x Polypropylene WashersAdvantageWasher made from durable polypropylene material and nails made from steel material, won't break easily.The leaf of the expansion tube is warped to prevent rotation and increase the fixing force.Instruction1. Put your insulation board on wall or ceiling.2. Drill a hole on the insulation board and wall.3. Fix the insulation board to the wall. Put the plastic expansion bolt in the hole firstly and then insert the steel nails into the plastic expansion bolt with hammer .Note:Please check the sizing and compatibility before purchasing.