Grid Base with CastersThis four way grid base is an ideal solution for creating mobile floor units with ample vertical space for merchandising. Check here for grid accessories. We suggest using 2' x 4', 2' x 5 or 2' x 6' panels. Simply set the panels into the base and bolt into place. Then use fasteners to join the grids together usually one fastener every 12" to 18" of vertical height for good stability.