The 24" square outdoor umbrella base is constructed of selected heavy-duty steel with a powder-coated surface, ensuring its weather resistance and rust resistance for outdoor use. Equipped with 2 adapters, it can fit different umbrellas with a diameter of 1.6" or 1.9". Also, you can utilize the 2 adjustable tightening knobs to secure the umbrella pole preventing it from wobbling or falling. Other than that, this umbrella base is designed with 2 built-in wheels on one side and a carrying handle on the other side, allowing you to move effortlessly in any area of the patio, terrace, backyard, and deck. And the umbrella base weighs 50 lbs, which ensures the umbrella does not move during use. Moreover, the umbrella base is quite easy to assemble, just put the pole into the hole, rotate the pole, and tighten it, then you will get a solid umbrella base to support your umbrella while enjoying your leisure time with your friends or family.