1.Adjustable: You will receive 1 set of beach umbrellas sand base weights, measuring 15 x 16 inch; The middle anchor hook collar is adjustable, allowing you to adjust according to the size of the beach umbrella pole and fits 1" to 1.4" diameter beach umbrellas. 2.4-Sided Design: Our sun umbrella base weight bag adopts square design, with 4 holes matching the sun umbrella 4 corner hooks, which is larger in size and can put more sand, so that the beach sun umbrella can be more stable. 3.: Put the beach umbrella pole through the large hole reserved, adjust the anchor hook collar into place, and fill it with sand to add weight. When not in use, the sand is poured out and can be folded storage to save space. 4.Quality Material: Our beach umbrella sand bag is made of 600D Oxford cloth, which is waterproof, strong, not easy to damage or wear, and can be used for a long time.