Onstage's 1 3/8" Cabinet Insert mounts into the speaker's cabinet providing your PA system with an adapter that fits 1 3/8" speaker stands.
I was gifted a pair of broken PA speakers recently, that included On-Stage stands. The stands did not fit the inserts in the speakers, but someone had forced it, breaking the original plastic inserts. I used the part number of the stands to find the size of insert needed and ordered these. Install was a snap, just a minute or two with a bit-driver to pull out the old screws, toss the broken plastic insert, and secure these with the included screws. These fit the stands perfectly, are a durable, high quality metal, and should last forever.
Just checked to see if bhphotovideo offered these and they did. Best price and quick delivery! I am learning that this is my one stop shop for electronics period!!! Thank you Bhphotovideo!