In old public facilities, metal wiring is used for electric wiring after retrofitting. I tried to exchange a mall where rust and dirt became conspicuous due to aged deterioration and purchased it. No 4 size was sold to home centers, etc., and it became a net purchase. So, when I applied this mall to the metal mall to exchange it, I noticed that I could cover the existing metal molding so that it could be hidden neatly. Then we used double-sided tape to attach only the cover of Pramole to the existing metal molding. I am impressed with shortening of replacement time and beautiful appearance. From next time, I think that you can sell only the cover if possible.