Seismic Audio - Pair of Subwoofer Speaker Add On Stands/Poles PA/DJ Model # SA-Subwoofer Stand (Pair) Heavy Duty Speaker Stands. 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.