Posts and supports are designed with double rivets and keyhole slots to form a rigid framework. The design allows access to the shelves from all sides of the unit. Assembly is easy with only a rubber mallet required. Shelves are supported on all four sides with V-designed shelf supports, and 36" deep units have one center support for added strength. 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.