Enclosure Carts are an effective way to keep contents from moving or falling off during transportation. The rods and tabs are adaptable to any shelf position. The bottom solid shelf on cart prevents dust and other contaminants lifted off the ground from entering below while the unit is in transit. Units consist of 4 - posts, 3 - Wire shelves, 1 - solid shelf, 4, 5 or 6 - rods & tabs kits, 4 - 5" swivel poly stem casters, 2 with brakes and 4 - donut bumpers