This umbrella base is a hefty 70 pounds for use with free standing umbrellas. The 20 inch diameter makes it stable in moderate winds where a 7 to 9 foot umbrella is handy for shade. It comes in two pieces, a 35 pound base plate that can be bolted if necessary to a deck for extra security. The 35 pound ring sits securely on top of the bottom to make a clean and pleasant umbrella base. This umbrella base is made from plastic filled with concrete from the factory. The 16 inch stem give vertical support to make a good choice for your free standing umbrella. It can be used with a table if the table will accomodate the overall height. This umbrella base may be used with 1 1/5 inch to 2 inch umbrella poles.