Our 30 lb. Add-on Weight for 50 lb. Belmont and 100 lb. Ribbed Bases provides additional stability for your umbrella in high-wind areas. The weight can be screwed on to the bottom of the 50 lb. base and the 100 lb base.Minor assembly required At Frontgate, our primary focus is quality. We guarantee that every product we sell will stand up to the supreme test – our customers' satisfaction. To learn more about our policies, visit our Shipping & Processing, Returns & Exchanges and Warranty & Price Guarantee pages.