The Premier Metal Art Tray (36”) by Studio Designs is constructed with durable, powder-coated, steel. The 7/8" U-shaped opening accommodates some of our Studio Designs tables or any tabletop between 3/4”- 5/8” thick. This workspace organizer features an oscillating mesh cup and deep compartments for your art supplies. It can be mounted to the rear of most art tables. You also get two removable “Flexible Foam Organizer Trays” (also sold separately) to keep your pencils, brushes and markers in order and a cell phone slot to keep your phone clean and close during your projects.