The top of the table is pre-assembled you just bolt the legs on. The top is totally uncentered. There is 1/4 in on one side to the edge of the table and 2 1/2 inches on the other side! After assembly it the table looks very crooked  The wrench included bent on the first nut it was so flimsy. One of the casters was bent and we had to hammer it flat to use it. The materials are heavy and nice but the overall quality is very poor. Not worth the price.