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