Seismic Audio - Subwoofer Speaker Add On Stand/Pole PA/DJ Sub Model # SA-Subwoofer Stand Heavy Duty Subwoofer Speaker Stand. Adjustable: extends from 36" to 54" Holds up to 200 lbs. (Steel). Fits 1 3/8 inch hole tight or 1.5" holeloose large heavy duty adjusting knob and very sturdy Brand New, Never used. Pin lock with multiple holes.