This 17.5" heavy-duty round umbrella base is ideal for holding your beloved umbrella to beautify your surrounding environment.  This is our 17.5" square umbrella base which is ideal for holding your umbrella securely and evenly in place. It is a really practical addition to your backyard or your patio area. Includes a coupler to allow it to fit 38mm to 48mm (by removing the adapter) in diameter umbrella poles. Includes a hand-turn knob for securing the umbrella to the base.  Don't hesitate to add this user base to your cart.  ● Classic Round Base: 17.5" square umbrella base is suitable for most outdoor umbrellas. Such a classic will never be out of time. Square decorative pattern plus bronze finish make your sun umbrellas much more attractive. ● Great Stability: The updated base is in particular designed to have two parts: steel umbrella holder and resin base. This construction is known for better stability. Further prevent your umbrellas from falling down. ● Pole Adjustable in Diameter: The pole of this patio umbrella stand is adjustable in diameter from φ1.5" - 1.9". Plenty of umbrellas of various sizes can match our base. Much convenient. ● Highly Durability: This umbrella base is made of premium quality material to reinforce its structure. A high-density resin base is good at keeping shape not easy to be chipped off or broken. It can hold your beautiful umbrellas well. ● Outdoor Use: The umbrella base can be used on plenty of occasions. Pretty practical and essential to sun umbrella. Our umbrella base will be a good companion for the garden patio terrace balcony barbecue bar western restaurant beauty salon and so on.