1 Piece Professional Grade Vacuum Brazed Diamond Drill Bits Diameter: 30mm; Total length: 60mm; Diamond height 10mm; M14 thread Wet or dry drilling for porcelain tile ceramic granite marble stone Vacuum brazed technology provides much longer life than electrodepositables Less chipping; Minimize breakage; Less heat generation; Best Finished Quality PRODUCT NAME: Professional Grade M14 Vacuum Brazed Drill Bit Cores Thread Diameter 30MM QUANTITY: 1pc SPECIFICATION: Diameter 30mm, Total Length 60mm, Diamond Height 10mm, Thread M14 (very important for fixing on your machine) FEATURE: Wet or dry drilling Wide application for drilling ceramic tile, marble stone, granite... Vacuum brazing technology provides much longer service life than electrodepositables (typically 3- 5 times) Less chipping, reduced breakage, reduced heat generation, better finish quality High diamond exposure rate allows for faster, more aggressive drilling. Save your money and time...Attention: Our product price only