When I received the item it looked very well made and I bought 2 at a very reasonable price. When I put them on the electrical box, they didn't fit in the side holes. I didn't want to force it and risk breaking the lid. I almost sent them back but ended up at Revain and read a review where a lady suggested dipping the part holding the lid in a glass of very hot water and then putting them on. It worked like a charm!