Rubi Mini Drygres Hole saw Set (50938)The range of drill bits in the MINI DRYGRES kit is recommended for drilling of all types of ceramic tiles, especially porcelain tiles and other wall materials such as marble and granite. In the drill bits in the MINI DRYGRES kit, RUBI has used VACUUM BRAZED technology, which increases resistance to temperature and friction, in order to fix the diamond particles in the cutting area. The drill bits in the MINI DRYGRES kit are perfect for installing