Diamond Polishing Drum Wheels are used to polish inside radius such as undermount sink holes.
They are much easier than diamond polishing pads to use when polishing inside radius.
Wet polishing will generally result in better shine and also the tools will last longer. With M14 thread, the wet diamond polishing drums can fit on most polishers and variable speed grinders.
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A little pricey but they do a good job. Fast delivery.