Some guys just have to have a smooth inner wall box. Thats all they have ever seen, so they think thats the way it should be. Fortunately, the geniuses at Kundel figured a way to make one. Not just one like ever other manaufacturer makes, however. That would be too easy. If Kundel was going to make a smooth wall box, it was going to be a better one. And they have!