It works, but its construction isn't of the highest quality. A body crimped to hold a twisted wire brush will begin to wear out in less than an hour of use. This causes vibrations that make the grinder difficult to hold. I had two of them, the first broke quickly and was unusable due to vibrations. A second one doing the same sort of job still works fine after about an hour of use. However, it is slowly beginning to fade. This cup brush is therefore intended for short-term use. Buy a Dewalt mug brush, I've had one and it's lasted many years, it's more than double the price.
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