Three adapters cover 1.89, 1.5 and 1.42 in poles, which between them fit most 6 to 10 ft market umbrellas, and two knobs clamp the pole from opposite sides so it cannot lean in the socket. The reservoir takes 57 lbs of water, 66 lbs of sand, or 88 lbs as a mix - the mix being the recommendation for larger canopies. Empty it weighs 5.5 lbs and measures 20 in across by 16 in high, in high-strength HDPE that will not crack in frost or fade in sun. A user manual comes with it.