The range of bits in the MINI DRYGRES kit are recommended for drilling all types of ceramic tiles, especially porcelain stoneware, and other covering materials such as marble and granite. In the DRYGRES kit bits, RUBI has used VACUUM BRAZED vacuum welding technology, which increases resistance to temperature and friction, to fix the diamond particles to the cutting area. The DRYGRES kits have been designed, mainly thinking, so that the user can obtain the best results when it comes to making the necessary perforations for water inlets, drains, light points, with the added sizes of 6 and 8mm for bathroom accessories etc