The unit was well designed except for the black pointed screw covers that go in the screw head on the sides of the unit. To assemble the unit the screws had to be screwed in tightly or there was a gap in the frame and the shelf. If the screw was tightened as was necessary so there would be no gap then the black covers with the tip, the tip would not go into the screw head and therefore fall off. Had to glue them in and that did not work well.