This boom is designed specifically for the Adam Hall SKS- XB column stand (which is what I use it with). It works well and is suitably well-made for the price. The telescopic boom gives plenty of length over the keyboards/stand, even on a diagonal (i.e. if your stand is side-on to stage rather than facing straight out to the audience) so you'll have no problem reaching the mic. Of course you can also use this boom attachment on a conventional mic stand, too. All for under a tenner. You can't really go wrong.
I bought one of these to go with My Millennium KS-3000, as I thought it was the same as the Adam Hall stand. However it doesn't, and was momentarily disappointed, until a friend of mine gave me a thread adaptor ( that is similar to the K&M 215)
So for an extra 2? you get to use it on the cheaper Thomann stand