You may not know how to use this thing.

Imagine, breakfast stall, barbecue stall, outdoor cool, too strong sunshine,

need a big sun umbrella to block the sunshine,

but there is no base, the umbrella is going to fall down, people can't hold it all the time

at this time, our artifact appeared,

the middle tube is put in the umbrella pole, and then it will be OK to clip the table edge