5- Material:Galvanized steel
One layer Type--------- Small groove, only good for one layer or film or net.
Two Layer Type--------Big enough to fix two layer of film, shade net or insect net.
Use: The Film Lock Device and wire is designed exculsively for flexible material fastening in greenhouse construction, such as greenhouse film, shade cloth, insect net and shading net etc.
Character:Easy and quick installation, good corrosion resistance and strong elasticity.