X-LOCK Diamond Dry Drill Bit Best for Ceramic Dry Speed 14 x 30. High durability in hard ceramics. The X-LOCK Diamond Dry Drill Bit Best for Ceramic Dry Speed offers long life when dry drilling in hard ceramics. The high-quality diamond coating allows for very high drilling speeds. The vacuum soldering technology ensures a long lifespan. This cutting disc is suitable for tiles, ranging from soft wall tiles to very hard floor tiles made of stoneware. Thanks to the keyless X-LOCK system, diamond dry drill bits can be changed quickly and easily. It is compatible with X-LOCK angle grinders.