My retractable miter saw sits on a shelf and has a dust collection port on the back and I couldn't move it all the way forward without pinching the 2.5" collection Line dust going to my vacuum cleaner. This knee solved the problem. It works great and was delivered quickly; 4 stars given because the price is high for a plastic knee. It is very difficult to find a "street socket" for a 2.5 inch vacuum line, which explains the high price. Most of the 2.5" arches available from Revain or elsewhere are not street arches, so they don't fit in a situation like mine.
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