3 issues with manufacturing workmanship: 1. Dado slots for shelves (there are 10, 5 on each side) were not cut to the same depth slot to slot. 2. Each dado slot was not cut to a uniform depth. 3. Two of the five shelf boards were not cut square. The end result was if you tightened the screws the whole frame twisted out of square and it was impossible to fit the top and bottom assemblies together. After routing the all the dado slots to the same uniform depth and squaring the shelf boards, the units assembled easily and the rack is square. Given the rework I had to do, not worth the price.