The distance between the 2 supports shoulb be 6.5cm and you can support every trombone in the world. Here it is 8 cm so you cant't put a trombone on it
I have been looking for one of these for quite a while since setting up a dust collection center in my shop. I looked on Craigslist, eBay, Amazon, eReplacement Parts, etc etc with no luck at all.
I'm glad I found a company that can actually make what I need. It fits perfectly and I can now use my new dust collector!