Tennsco Corporation B-53BK Welded Bookcase, 34-1/2" Width x 52" Height x 13" Length, 4 Shelves, Black Built-in shelf support tabs mean no clips to lose Durable shelves are designed tough; Each shelf is capable of supporting 120 lbs Each shelf adjusts vertically in 2-5/64" increments to accommodate materials of any size; Shelves can also be adjusted on 12-1/2" centers, which are clearly identified perfect for binders Extra strength is added in the welding process, providing years of heavy use