This is a well done beautiful shelf, easy to assemble, and flexible in use, because shelves and the width of positioning vertical metal holding bars are all adjustable. The assembly instruction tells you to first assemble it all and then only to fasten to the wall. This would be most difficult, because glass would be in the way of fastening. I first assembled it to see the desired positions (especially of metal rods), then removed the shelves, installed metal rods on the wall and only after that put shelves back into groves. The result looks beautiful!