Finally my desk is 5” long standing desk and it is two inches thick. It barely slid on but it did so if your desk is ANY thicker than that this WILL NOT work for you. However, if you bought a cheap boom arm first, like most of us, keep your clamp because it just might fit.
https://www.amazon.com/InnoGear-Sturdier-Microphone-Suspension-Adjustable/dp/B07DHLSTLV