General description Professional Grade 30mm Diamond Drill Bit with M14 Thread is designed for dry drilling in porcelain tile, granite, and marble. This drill bit features vacuum brazed technology, which significantly enhances its lifespan compared to traditional electrodeposited bits, providing a longer service life and better finished quality. Technical specifications Diameter: 30mm Total Length: 60mm Diamond Height: 10mm Thread: M14 Usage Suitable for wet or dry drilling Ideal for ceramic tile, marble stone, and granite High diamond exposure rate allows for faster and more aggressive drilling