The Brookside Design Wall Rack KIT comes complete with w/12 pivot hangers and 12 Hanging Clamps (42"). 

Hanging Clamps are easily inserted and removed from the pivot hangers. The pivot hangers allow you to view blueprints w/o removing from the wall rack. Different size clamps can be used at the same time. Wall Rack dimensions: 17"W x 4"H x 24.5" L.