18" Steel Raised Shelf Accessory for Stackbin WorkbenchesThe 18" high steel raised shelf is available in (4) different lengths, and can mount to any workbench. Most riser units attach to the top worksurface (on steel tops they mount from the side), and can be stacked up on top of each other up to 36" high. Providing shelves are the same length, the 6" and 12" high raised shelves can also interstack with the 18" high riser. We offer other items such as rear backplates, full rear enclosure panels, and