I am impressed with the high quality of these brackets. I've noticed in the reviews that people buy them too often and complain that they don't match the speaker. Check the internal thread size of the speaker first! I also tried some Chinese knock offs that look similar and returned them before I bought them due to color errors. This Omnimount brand is the best because they have the most durable stainless steel hardware that won't rust over time. If you look closely inside a ball grip vise, you will notice that the small tips are angled slightly in one direction. For this reason it is important to place the right side according to the instructions when installing a heavy speaker. The balls are made of soft plastic and the spikes create small indentations as they grip the balls. Here are the different thread sizes depending on the product model: This Omnimount 5.0 W/C (5 lb) has a screw that fits either a 4mm or 5mm thread size. The Omnimount 10.0 W/C (10 lb) has the most common speaker thread size 1/4"-20 (and includes a 5mm adapter). The Omnimount 20.0 W (20 lb) has a 3/8" "-20 thread size 16 .
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