Review on Hubbell Bell CP450S Metallic Weatherproof Accessories by Marcus Hargrave

I bought these to fill the half inch unthreaded holes in the extra plates. It doesn't work for that. The good news is that I had an outdoor project where I was installing outdoor outlets with threaded holes and needed to fill them up. It worked for that, so I didn't bother returning them. It's important to note that they don't just perfectly cover every half-inch hole. You are specific. And depending on the situation, you may need expansion washers or rubber plugs or line connectors, especially if you're just dealing with non-standard applications.