Gator Frameworks adjustable subwoofer speaker pole is designed to fit the traditional 1 3/8” pole mounts as well as the M20 size by utilizing the included adapter. Rugged, all steel construction gives this speaker pole the ability to handle up to 132 lbs. (60kg) of weight while the built-in safety pin assures it all stays in place. The GFW-SPK-SP Frameworks Sub Pole can quickly adjust from 35” to 60” using the easy-grip tension knob making setup a breeze.