This Rubi 6mm dry cutting diamond drill bit is available in a range of diameters including 8mm, 12mm, 20mm, 28mm, 35mm and 43mm. This tile drill bit is used on the hardest material’s such as porcelain, granite, stoneware and other materials. Recommended to work at extreme speeds to drill holes in seconds when using it with angle grinders or electric drills. Designed with vacuum brazed technology to increase resistance to any friction and temperature when in use. This is the perfect choice of tool when it comes to creating holes for pipes when installation bathrooms etc.