They don't disclose that you need a router!! There is a guide that has to be installed on your floor to keep the door from swaying in and out. You need a router to put a slot in the underside of the door. It doesn't show it in necessary tools on the poorly written instructions either.  All of a sudden there is just a instruction step' Use router to add a slit.....' Now I have a swaying door as I do not have a router.