The plate barely covers the 3/8 hole. The bottom half should snap into a 3/8 hole, but it's too small to snap into anything. They were useless to close the 3/8 hole!
Pros
The wings of these plugs flare out on the sides of the hole to hold them in place. These domed plugs are the finishing plugs for unwanted or unused holes in the chassis or other surface. The arched design tapers to a thin edge for a seamless finish. The matte head provides a professional and finished look.