Until now, we used products made by Panasonic, but this one is cheaper and quality can be used without any problem. Compared to rectangular hooking ceiling, the pitch of the screw is longer and it can be fixed securely. The only improvement point is that the wire connection is black. Because of the nature of the product, because it works in dimly lit places, if it is black, the engraving on the grounding side is very difficult to see and the hands of work are stopped. I think that it would be perfect if improvements such as changing the color or making the part of the engraved marks to white letters are done.