Boom Microphone Table Vise Replacement
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Boom Microphone Table Vise (Replacement)

This design is a replacement a table vise clamp for a typical but very popular cheap microphone boom stand at the bottom of the mic boom which fits into a 12mm hole that is around 30mm deep ...

similar models —

Boom Microphone Table Vise (Replacement) alternatives
UFS059 Table Vise
UncleFrankSays