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Check the listing for details. 20pcs 3mm Rougher Surface Rotary Diamond Burr Drill Bits Grinding Carving Tool;;. Condition: New. Listed at 13.12 USD. The Diamond Rotary Grinding Set features a rougher surface that is quicker than larger grit burrs when Sanding, Polishing, and Engraving. 20pcs Diamond Burr Drill. Quantity: 20pcs (10 styles x 2). It provides high working efficiency and a perfect grinding effect.