Heavy 12 gauge shelves are enclosed on 3 sides, 48 in. high above the deck in sturdy 1-1/2 in. angle iron corners and top trim. Mesh sides for greater visibility and air circulation. 2 swivel, 2 rigid 6 in. x 2 in. polyurethane casters with 3600 lbs. capacity. Shelves have flush edges, and 15 in. clearance. Overall height 57 in.