Tightening mechanism is poorly designed and does not stay tightened. Over a period of one to two hours the umbrella came loose from the stand and blew our glass top table over shattering into a million pieces and also bending the umbrella pole rendering the umbrella useless. We’re out a table and umbrella. Should I ever replace the umbrella I will drill a hole through both the stand and umbrella pole modifying the retention mechanism so that it will hold the umbrella in place without loosening and destroying everything (umbrella/table).