Open design offers convenient 4-way access while minimizing dust accumulation and maximizing light and sprinkler penetration. Shelves are easily adjusted on 1 inch increments with numbered posts. 5" rubber stem casters with a 800 Lbs. capacity, ensures a smooth roll. Sturdy frame comes in Nexelon finish. Polymer composition shelf mats are of a modular design allowing easy removal for cleaning. They have a vented open grid surface that is smooth and crevice-free. Polymer material will never dent, chip, rust, or corrode.