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The black Subwoofer Pole with M20 Thread from On-Stage is designed for pole mount subwoofers and features all-steel shafts that telescope from 30 to 54” (76.2 to 137.16cm). These shafts are held tight with a friction locking knob backed up by a captive steel security pin to help avoid tilt and wobble. The lower shaft features 1.61” (41.00mm) diameter steel tubing terminated with a zinc plated threaded lug. The upper shaft is sized to fit satellite speakers with standard 1 3/8" pole mounts. The black M20 Speaker Cabinet Adapter from On-Stage allows you to help upgrade your subwoofers by replacing the existing 1 3/8" sockets with the SSA20M threaded speaker adapter. It is designed to be a direct replacement for most socket mounts and all you have to do is simply remove and replace. M20 threading helps provide a rock-solid, wobble-free connection between the subwoofer and compatible speaker poles. This Speaker Cabinet Adapter is suitable for use with the SS7746 Adjustable Subwoofer Shaft (sold separately). Kit Includes: 2x On-Stage Subwoofer Pole with M20 Thread 2x On-Stage M20 Speaker Cabinet Adapter 2x On Stage Mic Cable