Secure your patio umbrella with ease using the US Weight 40 Pound Umbrella Base. Made in the USA, the 16.48-inch L x 16.48-inch W x 2.85-inch H base features a 4-inch stem that accommodates umbrella pole sizes ranging from 1 inch to 1.5 inches in diameter. Additionally, the stem includes a support knob to tighten and secure the post in place. This base is made with UV-stabilized polymer that will not rust or dent and can be easily cleaned. This 40 -pound umbrella base is intended only to be used with patio tables.