The Metabo 628300000 is an M14 threaded diamond hole saw for drilling through ceramics. It is 6mm in diameter and is designed to provide precise and chip-free cutting for a wide range of materials, including ceramics, porcelain, glass, and granite. The diamond cutting edges have a longer service life than standard carbide-tipped saws, and they are more resistant to wear. It is designed to be used with Metabo's EHE rapid core drill machine, which makes precise, perfectly round holes quickly and with minimal effort.