This is PART of the Mounting gear set for VOMO models 2021 and later versions. Large Stainless Steel washer 3 inch diameter (7.62cm) and 5/8″ hole in the center. Thickness 1/16 of an inch. Not threaded. You can purchase the Complete Set via this link – MOUNTING Gear Kit for VOMO 2021  Portable Vocal Booth Mounting Gear set for setting up VOMO on a microphone stand or a Portable Tripod. Designed to work with any stand or tripod that has a 5/8 -27 threaded vertical pole.