A quick change disc is a sanding disc that has a hub bonded to its backing. The hub is either plastic or metal, and can either have threads, or make allowance for it to be threaded onto a sanding machine. The advantage is that the disc can be quickly replaced when needed.
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Quick release skewer — A quick release skewer is the rod, threaded on one end and with a cam assembly on the other, a part of the quick release mechanism, a lever operated cam system used with a hollow axle for securing the wheels on a bicycle. Wheels equipped with… … Wikipedia
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