DOCUMENT STORAGE - Perfect for organizing large documents, plans, artwork, drawings, and more HEAVY DUTY DESIGN - Holds up to 1,200 sheets with a total weight capacity 240 lbs. - or 20 lbs. per clamp EASY TO TRANSPORT - Fully mobile on four 3" ball bearing swivel wheel casters, two of which lock to keep the rack in place when required BUILT TO LAST - Steel construction with durable powder coat finish for dependable performance SAFCO COMPATIBLE - Use with Safco Products Data File Extension Model 5056 for extra storage - sold separately