Designed for daily and intense use, taking on demanding conditions in stride. Durable metal frame and panel holder, excellent for heavy use. Letter size 20 viewing sides, not expandable. Glare-free, environmentally-friendly polypropylene panels with rugged frames for heavy use. Includes metal panel frame, metal panel bracket with 10 black panels or assorted color panels (2 each red, black, dark blue, green, yellow). . Replacement panels available (566601). Ideal for use in industrial areas including warehouses, kitchens and factory floors. TAA Compliant.