Diamond-edged for fast accurate drilling clean, concentric holes into very hard ceramic tiles and other materials including porcelain, slate, granite and marble. Easy-start tip prevents walking for greater accuracy and slotted steel body for waste removal. Easy water feed system (supplied) and slotted head for improved water cooling. Specifications: For use on materials up to including Class 5 hardness rating. Suitable for use with standard corded or cordless drills.