Check the listing for details. ProX X-SPAM20X2PKG M20 Threaded Deluxe Subwoofer Sub Pole Mounts Pair idjnow. Condition: New. Listed at 58.40 USD. The ProX X-SPAM20X2PKG is a package of two X-SPAM20 adjustable loudspeaker poles with an M20 thread, and an included carrying bag. Height adjustment is easy; just mount the pole to the top of a subwoofer with M20 thread and the other end mounts to 1 3/8" speaker pocket. Pole is adjustable from 33" up to 53" total height. All Steel Construction with a built-in safety 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 or wobble. The X-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 telescope to the height you want, held tight with a friction locking knob backed up by a captive steel security pin. The lower shaft features steel tubing terminated with a threaded lug. The upper shaft is sized to fit satellite speakers with standard 1 3/8" pole mounts. ProX X-SPAM20X2PKG Threaded Subwoofer Pole Mounts Features: Adjustable Subwoofer Poles Fits Threaded M20 Subwoofer Pole Mounts and 1-3/8" Pocket. Fits Traditional 1 3/8" and Threaded M20 Subwoofer Pole Mounts. Includes Removable 1 3/8" Pocket Adapter. Includes ProX Carry Bag. Minimum/Maximum Height: 33" to 53". 125 lbs. (56.7 kg) Weight Capacity. All Steel Construction. Built-In Safety Pin. Ergonomic Tension Knob Height Adjustment. Each X-SPAM20X2PKG Retail Box Includes: (2) ProX X-SPAM20X2PKG 20mm Threaded Deluxe Subwoofer Pole Mounts with 1 3/8" Adapters(1) Carrying Bag