18" x 60" x 80" Mobile Wire Shelves & Solid Shelf Stem Caster Carts add versatility & flexibility to any operation, creating a transport system. The bottom solid shelf on cart prevents dust and other contaminants lifted off the ground from entering below while the unit is in transit. Unit consists of 4 - posts, 4 - Wire shelves, 1- solid shelf, 4 - donut bumpers and 4 - 5" poly stem casters, 2 with brakes.