On Stage SS7746 Adjustable Subwoofer Pole with M20 Thread eliminates any and all wobble that would translate to the subwoofer. The steel shaft pole telescopes from 30 to 54 inches in height. The captive steel security pin makes sure the adjustable steel pole wont move. The new M20 thread replaces the old 1.375 inch thread, and immediately removes the wobble and instability from the subwoofer. The lower shaft features 41mm tubing terminated with zinc plated threaded lug.