The Alvin® Blueprint Pivoting Wall Rack is a space-saving vertical filing system that consists of a wall-mounted steel frame supporting 12 pivoting brackets that swing freely to allow visibility and easy access to hundreds of active documents. The Blueprint Wall Rack will hold up to 12 hanging blueprint clamps (sold separately). They are made with industrial strength with a 240 lb. maximum capacity. The Blueprint Wall Rack will fit hanging clamp sizes 18", 24", 30", 36", and 42". It attaches to the wall at your desired height, however, requires mounting directly into wall studs or a solid surface. The durable barley color powder-coat finish is attractive and will last through sorting and scratching of blueprint hangers.