They look nice, but are not destined well.  The do not easily fit a 5 x 5 post.  The opening in the interior fitting is 5.125 x 5.125, so it literally slides down the post.  I confirmed this with Classy Caps, whose customer service was quite nice, and they agreed with me.  I was able to get these to work on my 5 x 5 posts with a little effort and a good drill, so I didn’t return them, but buyers need to be aware you’ll need to invest some extra time and care to install them.