The Rubi dry cutting diamond drill kit specifically designed for use with angle grinders, includes tile drill bits in sizes 28mm, 35mm, 43mm, 68mm and comes with a multidrill guide used for making accurate holes. The multidrill guide works by attaching it to the wall or floor surface using the suction cup for greater accuracy when drilling holes and can be used both horizontally or vertically. The diamond drill bits are used for dry drilling materials such as glazed tiles, natural stone, porcelain, ceramic, and other materials. They are designed with vaccum brazed technology to prolong the life of the diamond drill bit and have a maximum work speed of 14000rpm. Plus, this professional tool kit all comes with a handy plastic carry case.