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10Pcs 12mm Diamond Coated Core Drill Bits Hole Saw Glass Tile Ceramic Marble100% brand new and high qualityMaterial:AlloyColor: silverThis diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or otherMaterials and only needs water for lubrication.Can be used with a standard electric drill.Always use lubrication (water), otherwise the diamond core drill will burn.Start your hole diagonally, make a round trace and then hold drill straight.Size: 12mm/0.472"Quantity: 10 Pcs/Set