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Diamond Tool 120mm 1/2 Gas Sintered Stone Granite Marble Diamond Core Bit. Versatile Drilling Capability: Drills accurate holes in concrete, masonry, marble, stone, glass, and tile. Dry or Wet Drilling: Can be used for dry drilling or wet drilling with water for cooling. Customizable Sizes: Accepts custom requests for different diameters from 5mm to 150mm. OEM and ODM Support: Provides full customization services including label printing. High-Quality Materials: Constructed with carbon steel substrate and high-quality diamond segments. CE Standard Compliance: Meets CE standard requirements for safety and quality. Professional Technical Support: Experienced team available to answer technical questions.