This 24" Galvanized Steel Plate Base offers exceptional stability for outdoor table umbrellas. Up to 3 steel plates can be added for stability ensuring umbrellas won't fly away. Designed to withstand rust and corrosion and features a 1.5" diameter stem that is compatible with all standard commercial umbrellas. This base is ideal for any outdoor picnic table. Crafted in the USA and covered by a 1-year commercial warranty.