Front vertical edge is square All welded steel frame construction Double wall construction on side panels Bottom channels, bookcase top and shelves are all 18 gauge, back panel, side channels and side panels are 22 gauge Four leveling glides with 5/8" adjustment Shelves adjustable in 1/2" increments gap between bookcases when installed side-by-side Top is mechanically fastened, so may be replaced with laminate top To ensure stability, do not install a 4, 5, or 6-high single bookcase in the cente
