Alvin - Onyx Table Storage Shelf - 12 Inch Wide - The Onyx Table Storage Shelf is a great addition to the Onyx folding table, this sturdy steel shelf provides both storage and exceptional stability. The Onyx Table Storage Shelf is easy to install and remove without tools, allowing the Onyx to be folded conveniently for transportation and storage. Available in two sizes, both 26.75 inches long. The 9 inch deep shelf works best with 24 inch x 36 inch tops. The 12 inch deep shelf works best with 30 inch x 42 inch tops. Durable black powder-coated finish.áNote: These shelves fit Onyx tables produced after October 2007 only.áThe table back crossbar must be level with the side crossbars. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.