This fits a Manfrotto Super Clamp, and has 1/4" and 3/8" ends for microphone or camera mounts. I only use the 3/8" end but I bought it because I like its height/distance from the clamp. I can attach a mic clip or stereo bar to it then clamp to any bar, truss, drum stand or almost anything near where I need a mic, and not need a stand. With the Super Clamp it makes a high-quality, stable and unobtrusive mounting system of professional quality. I plan to mount small cameras with these clamps too and this one spigot makes the same clamp much more useful for more jobs. Great to have and takes up almost no space