This is a great mount with lots of adjustability (and even more options if you buy additional hardware from the hardware store), but unfortunately it doesn't fit. It always goes with everything. In my case, the M6 screws included with the keyhole soundbars were slightly larger than their size to fit the Polk Audio Signa S1's keyholes. This could probably be easily fixed by purchasing some M5 screws and locknuts from Home Depot, but then I found that the brackets weren't long enough to mount the soundbar over my TV due to the VESA mount arrangement I was using assemble. . They would be suitable for installing speakers from below, but I needed them above the TV and their length wasn't long enough. Very good fit and functionality
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