I bought these for a home renovation and installed them myself. Pretty easy to install and hook up. Size and where a plastic or metal clip would be required and couldn't find the info anywhere. I think I went with a .75" metal knockout for this and it worked well enough, but it would be nice if the wire clips were included. I also have the LED version so they don't generate a lot of heat and are IC rated I had one bulb start flickering almost immediately, luckily I bought an extra unit and have since replaced the bulb with no problems. They have been installed in Lutron dimmable Wi-Fi switches for months.