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Portable Hand Held Diamond Core Drilling Machine Glass Ceramic Marble Drill Bit. Smooth Drilling Performance: Ensures smooth drilling with no broken edges and easy chip removal. Wide Material Compatibility: Suitable for drilling glass, ceramic, tile, porcelain, and stone. Premium Material Construction: Made from high quality diamond and alloy steel for durability. Multiple Grit Selections: Offers #30, #40, #60, and #80 grit options for various needs. Diverse Diameter Range: Diameters available from 4mm to 150mm for versatile applications. OEM and ODM Services: Full customization available from samples or designs. Flexible Shipping Methods: Shipped via UPS, DHL, FedEx, Aramex, or air/sea/land.