The Rubi Tools 5/16" (8mm) Endure Scoring Wheel (01906) is made of high-quality tungsten carbide. It's grinding， unitary guarantees an angle of incision， exact and precise， in all units. Thanks to its care， and studied design， Rubi Endure wheels are ideal for excellent cuts in ceramic and porcelain tiles with a high cutting difficulty， especially for all those materials with rough and/or structured surface finishes (reliefs and textures ).