Review on Audio-Technica AT8459 Swivel-Mount Microphone Clamp Adapter: A Versatile and Sturdy Solution for Precise Microphone Positioning by Shane Wallace

This adapter makes it very easy to adjust the position of the microphone at the end of the boom. Constantly adjusting the 5/8" threaded bushings axis by axis is real agony when you need to both adjust the angle and rotate the mic - now all I can do is loosen a knob, change angle and rotation, and tighten. It goes in a step down. It's solid and strong, but weighs a little more than I expected, so if you're using a mic boom and it's already at its limit when holding a heavy mic (like the SM7B), then you might just knock over the edge.