Turn aisles into usable space and increase storage up to 43% . Chrome-plated steel units glide effortlessly on snap-together tracks. Easy assembly – No tools needed. Works on any smooth floor. Safety brakes keep shelves stationary while loading and unloading. Shelves adjust in 1" increments. NSF certified. 4 shelves per unit. Wire Shelving Accessories available. View video . ULINE offers over 43,000 boxes, plastic poly bags, mailing tubes, warehouse supplies and bubble wrap for your storage, packaging, or shipping supplies.