I used it because I use the mall and wire the house. For use, I used it at the joint part of the cable. Since there are incoming lines from various directions, usability is very good as there is a missing of the opening corresponding to it. In addition, since the color is white of a white type, compatibility with home walls and wiring equipment Cosmo 21 is also OK. It can also be used as a substitute for the pull box through the wall from the back.