Within its range of diamond drill bits for dry cutting, RUBI has the DRYGRES 4DRILL drill bits. The DRYGRES 4DRILL range of diamond drill bits is recommended for drilling all types of ceramic tiles, especially porcelain stoneware, and other covering materials such as marble and granite. In the DRYGRES 4DRILL range of drill bits, RUBI has used vacuum brazing technology, VACUUM BRAZED, which increases resistance to temperature and friction, to fix the diamond particles to the cutting area. DRYGRES 4DRILL drill bits are perfect for placing bathroom accessories or any type of decoration accessory on ceramic and/or natural stone surfaces.