5/8" is the standard thread for a full height microphone stand like the ones you see on a concert stage. Since microphone brackets are generally made to fit that thread, tiny tripod desktop microphone stands that have become popular for use by podcasters, gamers, USB microphone users, and so on, also use the 5/8" thread even though it is surprisingly large for a dinky little tripod. That stand looks like the one that comes with "Blue Snowball" usb mics, for example.