The combination of 2 outdoor umbrella clamp provides better flexibility, stability, and allows you to adjust the height to hold umbrella in place. The umbrella pole will not shake even on windy days.This patio umbrella holder with adjustable knobs is suitable for poles with different diameters from 1.3-2 inches.As the seasons change, it can be removed and moved to other locations as needed. Apaly for outdoor leisure umbrella base, family, barbecues, flagpole, umbrella base stand, patio umbrella base, and other leisure activities.This outdoor deck umbrella mount is made of well all-aluminum, along with the black coated finish, giving it a solid and sleek finish. Provides additional protection against rust and corrosion.Umbrella stands that do not take up room on the deck. You to easily and securely attach the umbrella clamp to various types of wooden railings. maximizes space and get all the shade we need. Much better than those bulky umbrella holders!