Pro X X-SPAM20 Deluxe Subwoofer Speaker Pole Mount with 20mm (1 3/8″) Adapter

ProX X-SPAM20 is an adjustable loudspeaker
pole with a M20 thread.  Height adjustment is easy just mount to top of
subwoofer (M20 thread), other end mounts to Speaker (1 3/8″) Pole is
adjustable from 35″ up to 60″ total height.  All Steel Construction with
Built in Safety Pin and Easy-Grip Tension Knob Height Adjustment.

More and more pole mount subwoofers are now equipped with M20
threaded pole mounts instead of a standard 1 3/8″ socket cup. A 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. Its all-steel shafts telescopes 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.  Included threaded adapter to fit
standard 1 3/8″ pole pockets.