The easy gres diamond drill bit range is available in various sizes, this 35mm diameter drill bit must be used for wet drilling, suitable for electrical drill without hammer to cut through porcelain tiles, stoneware, granite, marble and glass. Depending on which material it’s drilling through the recommended speed is between 400 to 1000rpm. It’s the perfect tool choice for installing bathroom accessories or types of decoration on ceramic surfaces, such as drilling for water tapping points, electrical connection and sewers etc.