This one takes 1 1/2”. Maybe snag your mount first to be sure. Mine is 1”. Either way, if you put in 1”drop pipe a thread reducing adapter is easy to snag for either case for a few bucks at hardware store. smile

https://www.amazon.com/QualGear-QG-PRO-PM-50-W-Pro-AV-Threaded-Accessory/dp/B01B1JEOQO/ref=sr_1_19?dchild=1&keywords=Projector+mount+1”+pipe&qid=1617747923&sr=8-19