for most umbrellas with pole sizes 1 1/2' - 1 3/4' For umbrellas, volleyball poles and tiki torches, available in 7 1/2‘ inch size, designed for most umbrellas with 1 1/2' - 1 3/4' poles. If your umbrella stand pole is 1.5' in diameter, you can simply use this stand without any modifications. However, if the pole size is larger than 1.5 inches, you will need to remove the pool umbrella stabiliser adapter in order to securely mount the larger pole to the stand. EASY INSTALLATION: Press-in flange, no glue required, flange is removable. If a 1.5' size adapter is used, the cover will not be used and the adapter will need to be removed to reduce water leakage. Wide range of applications: easy to replace, can be installed on floors, steps or decks Built-in stopper to reduce water leakage, threaded cap closes the unit when not in use Kit Includes: Includes rod holder base, flange plug, adapter and cover