PT. Surya Graha Dekoratama sells roofing bolts of various types, brands and sizes. Roofing Bolts / Couplers / Nails are usually used for installing Asbestos roofs, Polycabonate roofs, Metal Tiles, Zinc Plates, Lightweight Steel Roof Frames, ZincAlume, Bondek, etc. Roofing bolts using a rubber seal function to prevent leaks on the roof.