The Shure A53M Shock Stopper isolation mount/swivel adapter reduces transmission of mechanical noise and vibration by more than 20dB. Compatible with the following Shure microphones: Shure 849 Shure SM81 Shure SM94 Shure VP64 Shure KSM109 Shure KSM137 Shure KSM141 or any 3/4" (1.875 cm) Shure microphone.