Greenguard Certified for Children & Schools Available in 2 shelf depths: 18" and 24" Available in 4 shelf widths: 36", 48", 60" and 72" Multirow storage system is easily customizable Increase usable space 4070% by converting aisles into more storage space Steel units slide effortlessly on our exclusive patented track system Tracks are not bolted to the floor Allows for maximum access from all 4 sides of shelf "Stepon/flipup" safety brake comes with each roller assembly, allowing units to lock in place while loading and retrieving Open wire design maximizes visibility and airflow 800 lbs.weight capacity per shelf, evenly distributed