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From polishing those newly found gemstones and rocks to cleaning small parts in restoration projects this rotary tool will fill any need in between. With 2 drums you can grind the rough stones and polish another at the same time. it can also clean hardware and will double your finish time. give the unit a quick double check the pulleys sometimes they are not true..Once adjusted though the belt will last a very (6 months) long time..Thats the only problem with these units.. a quick fix with a rubber band when the belt does break, or a vacuum cleaner belt is a great replacement.