The Black Steel Rolling Base with Caster is ideal for 8'x11' and 10'x13' umbrellas in a table, or 11', 8'x10' and 8'x11' freestanding umbrellas. If the table is too short, the dual purpose stem allows you to screw off half of the pole to make it fit under any table. The rolling base allows shade to be where you want; move the base with ease and then just lock the wheels to make the umbrella stationary. Product available in store only.