Dry Cut Only. Diamond drilling set for wall and floor tiles. For the Hole Cutting in Ceramic tiles and Porcelain tiles. For use with an angle grinder. Operational speed between 10,000 and 14,000 r.p.m. Cutters are finished with a M14 thread to attatch directly to an angle grinder. The drilling guide is a system for guiding, dry cutters whilst cutting as there is no centre drill.