The Heil SM-1 spider shockmount is for use with the Heil PR-20 mic and those with similar body shapes. An 8-point flexible suspension support system isolates the mic from vibrations. The 3/8" threads will mount to the PL-2T overhead boom and other standard microphone stands and booms. Features: 8-point support system 3/8" threads fit most standard stands/booms