This is a great product for the price but it doesn't work well when it comes to large/heavy speakers. The spikes are only about 1/2 inch long, making it difficult to touch them with your fingers to adjust and align the speaker. The same goes for discs, they are about the size of a dime with little dimples and hence it becomes difficult to tell if the dot is actually there or not. I think for small bookshelf speakers they will work fine.
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