European-to-U.S. chrome stud adapter from Windtech. It is a female 3/8″”-16 to 5/8″”-27 male thread that adapts European to U.S. standards for microphone stands and other mounting hardware.
Audio Technica/Sound Professionals
Microphone Pistol Grip with 5/8 inch Threaded Stand Mount. Fits AT822, AT825, ATR55 and Pro24