30mm Diamond Core Drill Bits with M14 Thread for Dry Drilling in Porcelain, Tile, Granite, and Marble

1 piece professional-grade vacuum-brazed diamond drill bit. Diameter: 30 mm; Overall length: 60 mm; Diamond height: 10 mm; Thread: M14. Dry or wet drilling for porcelain, tile, ceramic, granite, marble, and stone. Vacuum brazing technology offers a much longer lifespan than electrodepositing. Less chipping; Minimal breakage; Less heat generation; Better finish quality.