I bought these and an aluminum cover with holes for installing a motion sensor and LED spotlight. It was very easy to install the cable on it thanks to the supplied grommets and plugs, but when it came time to unscrew the cover the screws that came with the cover didn't want to be screwed in. I ended up using a rough look. Instead there were wood screws and I could imagine the plastic wearing down over time. If this block ever breaks or I change the mount in it, I can replace it with a metal box.