This is an OEM inner disc flange, which is found on the spindle of a handheld grinder. Its function is to secure the grinding wheel to the spindle and providing support to the wheel, along with the flange nut (sold separately). It has a 5/8-inch non-threaded hole and a recess in it that engages with the spindle, and a 7/8-inch hub to accept a standard grinding wheel. This part is prone to wear and tear, which can lead to an unbalanced wheel. This is a simple repair that should only take a few minutes and should only require a wrench.
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