Built with double rivet design and keyhole slots to form a rigid framework. Assembles easily and quickly with only a rubber mallet. The design allows access to the shelves from all sides of the unit. Shelves are supported on all 4 sides, except the second and fourth shelves that are supported front and back. The units have 5 shelf levels (4 openings). Buy the unit with 5/8" particle board decking. Available in Sand or Medium Gray, specify in comments when ordering. FOB Shipping Point. Surcharge may apply.