
Professional Granite Diamond Core Drill Bit. Vacuum Diamond Slot Technology: Enables fast drilling on granite, marble, limestone, and other hard stone materials. High Efficiency Cutting: Sharp head design with large displacement for fast chip removal and easy operation. Durable Diamond Material: Excellent diamond composition improves sharpness and wear resistance of the drill bit. Free Sample Availability: Customers can request free samples to test product quality before bulk orders. Customized Color Options: Color can be customized to meet specific customer requirements. ISO Quality Certification: Factory strictly conforms to ISO9001-2000 quality control system with EN standard inspections. Fast Sample Production: Sample production time is 5-7 days for quick evaluation and testing. Comprehensive After-Sales Service: Includes free replacement of damaged goods and free new packaging design.