How do you make the perfect shade garden? Make the shade PART of the garden! An open planter base accommodates up to 150 pounds of your choice of plants, sand, or gravel. Built-in drainage promotes water flow to spread oxygen and prevent rot; ample root space is augmented by the 6 drainage holes. While this base is not intended for offset umbrellas, the 2-inch coupler and 2 tightening knobs ensure a secure fit for market umbrellas! A set of built-in wheels allows you to enjoy this planter anywhere in your garden; the durable wheels are coated in plastic for extra security. Powder-coated steel ensures long-lasting rust resistance, and the durable construction is further complemented by weather-resistant components. Create a mobile shade garden the is two parts function and one part fashion!