The Mainstays 30 pound umbrella base is an economical way to securely hold your umbrella and keep it standing upright. Reliable and sturdy, this rust resistant concrete filled base will fit most standard market umbrellas with poles between 1 3/8” to 2” inches, and includes multiple ring inserts to adjust based on the pole size. Designed to be used with a table, not for use with free standing umbrellas.