... applications: Roof ,the roof structure, Balcony panels, water downpipe bay windows, window frames, doors, garage doors, shutter doors, kiosks, shutters, ... oil furnace, oil fast water heaters, water heaters outside the board, electric water heater shell, sticky rice cake ... Chromating Treatment, Oiled inside diameters :508 mm Outside diameter : according to the weight of coilweight/coil :3-8 tonPacking ...