Available in 15 Sizes(Diameter) Our Tile Hole Saw Set has 15 PCS Different Size 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 35mm, 40mm, 50mm. Suitable for your different needs.< br >Rustless and Durable The Tile Hole Cutter Made of high strength carbon steel with smooth nickel plated surface to extend the service life. The cutting piece at least six months to a year before grinding.< br >Faster, Sharp and Smooth Cut Tip Head of Diamond Hole Saw coated with High quality Diamond to enhance fast and precision cutting for a sharp, high precision and smooth cut with no broken edges In Seconds.< br >Multipurpose Our Diamond Drill Bit is suitable for drilling glass, tile bottles, blocks jars, fiber glass porcelain tile ceramic, vitrified, brick and stone.(especially for glass and tile)< br >Note Please keep the speed in 8001000 per minute, keep adding water to keep the drill cool, strictly prohibit from dry drilling.