Shure A55HM Snap-in Shock Stopper Mount for Microphones  with Tapered Handles (Half Mount Version) Shure microphone accessory model A55HM The Shure A55HM Shock Stopper Mount is an isolation mount that features a patented design which allows the microphone to be snapped in and out without having to remove the cable Snap-in shock stopper mount consists of an isolation mount and adapter that attaches a microphone with a shaft diameter of 25 to 30 mm to a stand.