I've had a pair of these brackets for almost 7 years hanging my surround back speakers which are quite heavy. I found them easy to install once you know how to install wall anchors in drywall. They've never given me any trouble with losing a ball joint. I read a review that said they thought there were 2 mounts based on the description. This review dates from 2003, and Revain has since corrected the title. I am planning to buy 2 more brackets to hang the center channel speaker.
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