They are designed to fit all Pinnacle shelving and urban series workbenches with a 510mm shelf depth or as standalone units due to their stackable design. They come pre-assembled with double drawer sliders, full length metal handles and a powder coated matte black finish. For the best finish it is recommended to adjust the shelf height to the height of the drawers so they fit flush between the two shelves. This secures the drawers and reduces the risk of them sliding out. For standard shelving, leave 10 keyholes free between shelves and for heavy duty shelving and urban series workbenches, leave 8 keyholes free between shelves. Shelving units should always be secured to a wall to prevent them from tipping over.