No shelves, cabinet sides unfinished, finished sides available in Custom Options section, made for built in microwave units, cut-out opening is 12 3/8" high by 23 3/8" wide, maximum cut-out opening is 22 3/16" high by 27 3/4" wide, cabinet is 21" DEEP, premium UV finished plywood cabinet box construction, 5/8" plywood hanging rails