Link to item on Amazon: note the description saying that their pile only fits their set ups https://www.amazon.com/Windscreen4less-Extension-Connector-Durable-Replacement/dp/B0828WD943/ref=sr_1_1?dchild=1&keywords=extension+pole+sun+shade+2%27+windscreen4less&qid=1600899812&sr=8-1

Also they say it’s 3” with wall thickness of 12.5 gauge