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Welcome to our store, we serve all of customer as our friend. If you have any question about this item, pls feel free to contact us in any time, we are always here for you. ¡ïWarranty¡ï: In there, you are backed by our Performance Assurance. If you have any issues with your product, simply contact customer service for troubleshooting help, parts, replacement, or refund. ¡ïPackage Included:¡ï 1 Pieces 3mm Diamond Drill Bit 1 Pieces 5mm Diamond Drill Bit 1 Pieces 6mm Diamond Drill Bit 1 Pieces 8mm Diamond Drill Bit 1 Pieces 10mm Diamond Drill Bit 1 Pieces 12mm Diamond Drill Bit 1 Pieces 16mm Diamond Drill Bit 1 Pieces 18mm Diamond Drill Bit 1 Pieces 20mm Diamond Drill Bit 1 Pieces 30mm Diamond Drill Bit 1 Pieces 40mm Diamond Drill Bit 1 Pieces 50mm Diamond Drill Bit 1 Pieces 60mm Diamond Drill Bit 1 Pieces 70mm Diamond Drill Bit