DIMENSIONS: * Posts: 2 1/16 x 2 1/16" * Beam Height: 2 3/4" * Outside: Add 9/16" to listed dimensions.MATERIAL: * 14 gauge steelCONSTRUCTION: * Upright Posts: One piece construction.WEIGHT CAPACITY: * Shelf capacity listed is the capacity for each shelf. * Overall: Not to exceed 13,000 lbs