The X-LOCK Diamond Dry Drill Bit Best for Ceramic Dry Speed offers a long lifespan when dry drilling in hard ceramics. The high-quality diamond coating allows for high drilling speeds, and the vacuum soldering technology ensures a long service life. This cutting disc is suitable for tiles – from soft wall tiles to very hard stoneware floor tiles. It is compatible with X-LOCK angle grinders. Thanks to the keyless X-LOCK system, diamond dry drill bits can be changed quickly and easily. Diameter (D) mm: 20, Diameter (D) inch: 7/8, Working length (L1) mm: 35, X-LOCK.