Fein Grout Removal & Tile Blades are ideal for removing damaged tiles. They are also great for cutting slots in Plaster, Porous Concrete & similar Building Materials. They are also used in cleaning and reworking deck joints on boats. These blades are available in both Tungsten Carbide Coating or Diamond Coating. The Diamond Coated Blades last approximately four times longer, with no noticeable loss of performance. The Diamond Coated Blades can also cut into very hard Epoxy Resin & Cement Joints and are the best choice for frequent use and challenging jobs!