Secure your patio umbrella with ease using the US Weight 26 lb. umbrella base. The 18.1” L x 18.1” W x 10.5” H diameter base features a 9.75” stem with adjustable collars. These collars accommodate a variety of umbrella pole sizes ranging from 1.3” to 1.9”. Additionally, the stem includes a support knob to tighten and secure the post in place. This base also includes 4 PVC feet on the bottom of the base. This 26 lb. umbrella base is intended only to be used with patio tables.