I bought this item to improve satellite speakers Vizio SB3851-C0 38" 5.1 channel -Soundbar (2015 model) to install. I think these brackets will also work with 40" and 54" models as the satellite speakers are the same. The brackets are made of hard plastic and are very light. It includes mounting hardware and an instruction manual. The brackets swivel and tilt so you can position the speaker at the angle you want The reason I gave it 4 stars is because I could only use these brackets on my Vizio satellite speakers by flipping them and mounting them that way In the vertical position, the lower part of the bracket, into which the speaker is screwed, rests against the speaker cable, preventing the sound speaker is screwed into the correct position. My solution was to flip the mount so the cable was out of the way. I recommend experimenting with the bracket and positioning it on the back of the speaker to see how it looks and feels before marking the holes for drilling, as using the bracket upside down actually lowers the speaker, not in the normal position. That being said, I would buy these mounts again and will definitely work with other speakers.
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