easy operate with the builts in cooling waxs for dry drilling and a triangular handle that provide a secures grip on multiple drill models Featuring grit coating and robusts brazing process, this drill bits ensures sharpness, long last cuttings edges for over 300 holes with out chipping Suitable for enthusiasts and professional contractors alike, this tool brings ease and proficiency to any tiling project penetrate porcelain tiles with our upgraded Serrated edges Drill Bits, doubling your drilling efficiency and precise Whether you ' re working on ceramic, glass, marble, granites, our drill bits is for smooth drilling in a variety of hard materials, Manufacturer: KACCDE