Shelving Shells hold all the San Francisco accessories. Choose from Wide or Narrow, Perching or Standing height. The side panels are finished in veneer and the back panel has several cord management cut outs. The shells stand 4" above the floor on two metal square tube supports. The shell can be outfitted with a variety of different shelves and drawers; all adjustable on 32mm center holes. The shell is independent of the desk so it can easily move if needs change.