They have a low profile and can be hung in a variety of ways to help with different screw spacing lengths. I particularly needed a hole that was cut more on one side than the other, so the adapter allowed me to hang it off center to cover the whole hole. The plastic adapter allows multiple screw configurations to be used with the same cap. There is a hole to attach the cover or a threaded hole that allows you to press it firmly onto an uneven surface. It's 5.5 inches in diameter and maybe 0.5 inches deep with a textured finish.
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