I had a problem installing the drawer rails inside the cabinet. It seems that the holes for the screws were not drilled properly and thus the screws did not go in. I had to widen the holes with my drill and I was then able to install the rails. The remaining problem though was that as a consequence of the lack of proper holes most of the screws went in on an angle and that caused some problems with the tracks on the drawers. I managed to partially resolve the problem, but the drawers sometimes stick.