TheProXX-SPAM20X2PKGis a package of two X-SPAM20adjustable loudspeaker poles with an M20 thread and an included carrying bag. Height adjustment is easy just mount to the top of a subwoofer with M20 thread andother end mounts to1 3/8"speaker pocket Pole is adjustablefrom32" up to 63" total height.All Steel Construction with a built-inSafety Pin and Easy-Grip Tension Knob Height Adjustment.More and more pole mount subwoofers are now equipped with an M20 threaded pole mount instead of a standard 1 3/8" socket cup. This type of screw attachment provides for no tilt orwobble! TheX-SPAM20 is designed for the modern production style of subwoofers as well as the original 1 3/8" pole pockets with the included threaded adapter to fit standard 1 3/8" pole pockets.Its all-steel shafts telescopes to the height youwant, held tight with a friction locking knob backed up by a captive steel security pin. The lower shaft features steel tubing terminated with athreaded lug. The upper shaft is sized to fit satellite speakers with standard 1 3/8" pole mounts.