I Needed  square planter saucers  to place beneath my dwarf hydrangea planters.. these are perfect!! Prevent water from draining out onto our deck And will be perfect for when brining them inside for the winter.  I initially ordered the wrong size,  however the diameter chart  shown was of great help. My planter base measurements are 12”.. so based on the chart ( inner dimensions of saucer) I ordered the 16”.. perfect size. So glad I found these.