The ShowMatch SMS118 Speaker Pole Mount Adapter is a M20 threaded loudspeaker pole adapter for use with the ShowMatch SMS118 subwoofer. The adapter is designed to be used as a replacement for the non-threaded pole adapter that ships with the SMS118 and works with the Bose AMM108 or AMM112 loudspeaker and the Sub1/Sub2 Adjustable Speaker Pole.