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Title: I don't believe 20 lbs rating.
Review: Idea of using an Allen wrench to tighten in tight area between the speaker and the wall is a very bad idea. Especially not easy to do when you're on a ladder, supporting your speaker with one hand. Would be much easier if I could use ratcheting socket wrench. Can't get it to support 15 lbs. speakers. The speakers end up resting against the wall. Maybe you'll have better luck.Directions that came with them seem to be bad photo-copies. Get on-line directions - not the highest resolution but better than the ones that come with the package.
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