Features an amazing height adjustment collar with an ergonomic u0026#34;Zu0026#34; knob that makes exact adjustments comfortable and easynThe collar on the tripod leg fitting prevents over-tightening and breakage issues associated with all plastic designs, plus our die-cast fitting is 30x stronger than materials used by the competitionnManufactured out of extruded double-drawn 6000 Series aluminum tubing, which makes the design incredibly strong but surprisingly lightnFits all subwoofers with standard M20 threading; threaded sockets found on JBL PRX, VRX, STX and SRX818 subwoofers minimizes buzzing and rattling and assures that the pole will be secure and straightnMount your speaker directly over your subwoofer to achieve optimal sound coverage with this gas-assisted speaker pole! The JBLPOLE-MA is made with aluminum tubing, making it light and easy to carry or set up but strong enough to hold up to 75 lbs. Ergonomic knobs and extra-strong fittings make it easy to adjust the height and grant you peace of mind knowing that your speaker will stay right where you want it to.