If I would have read in the very small print that I had to assemble the myself, I never would have bought it. The door panels are too wide and the last panel needs to be cut down for the door frame pieces  to fit correctly. It must be a manufacturing issue. The groove depth is 7/16 deep, and the panel extends about 1/2” past the tongue of the bottom, middle and top rails. Again, if I knew I had to assemble the door, I never would have ordered it. Buyer beware.