High quality diamond drill bit set that won't rust, cuts quickly - Made from high strength carbon steel with nickel plated surface makes these drill bits durable and precise; the head of the drill bit is made of 80 grit diamond coating, which is uniform; It helps increase drilling speed and sharper than other regular hole saws. 10pcs Most Used Size - Includes the following diameters: 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 50mm. Using laser marking, the size will meet most of your different needs. Application: suitable for drilling holes on glass, marble, tiles, pots, fiberglass , porcelain, tiles, ceramic, slate, granite, etc. Works with all electric drills and impact drills. Nice design – Center holes and side holes help remove waste easily; Nickel plated surface extends life and improves corrosion resistance Notification: When cutting hard materials, it is important to ensure that the cutter remains cool to avoid damage the material to be drilled and premature wear of the cutter. Water is necessary for lubrication when drilling, which can extend the life of the drill bit set. 10pcs Diamond Drill Bits, Hole Saws, for Cutting Glass, Tile, Ceramic , marble, porcelain - 8 to 50 mm Diamond drill: Diamond drills, diamond core drills, diamond hole saw or diamond drills. They are often called glass drill or tile drill but as they are used for drilling glass, ceramic, porcelain, tile, ceramic, limestone, slate, marble, granite, stone and fiberglass, so they are more general. Product specifications: Material: steel. Diameter of hole saws: 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 50mm. Application: suitable for stone, tile, ceramic, glass and granite. Good performance, long life. Very suitable for glass and ceramic tiles to make clean and precise holes. An electric drill works best (not included in the project). Instructions: 1. Start your hole diagonally, make a mark then drill. 2. Always use lubrication (water), or a diamond drill will burn. 3. Thanks to cutting concrete and tiles, it is very efficient. There is the smallest heat and it will not damage the drill. Contents: 10 diamond drill bits