@ high quality diamond drills with conome, fast cutting surface Made of high rsistance carbon steel nickel plating makes these drills durable and prcise; the tip bit of the tte is made of diamond grain 80 revtement, which is uniform; it contributes a lot to increase the drilling speed and sharper than other saws ordinaires.@ 10 pcs mainly used sizd Contains the following diameters: 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 25 mm, 50 mm; Laser marking help, the size will satisfy most of your differences besoins.@ application Suitable for use in a drill hole on glass, marble, tile, blocks jars, fiberglass, porcelain and ceramic tiles, slate blva0299, granite light stone, etc. It works with all drills and impact Drill.@ Nice design the center of holes and ct holes help easily remove the matriau of dchets; and the nickel plated surface, to extend the life span, improve the surface of the rsistance the corrosion@ type of notification when cutting hard matrials, it is important to guarantee the cutter is kept cool to avoid damaging the matriau drill and a premature wear of the tool; water is needed for lubrication during drilling, which can extend the life of the lot.Diamond drill, saw hole tools drills for glass/tile/ceramic/marble/porcelain, heart hollow drills cutting tool with diamond revtement, carbon steel 8 mm-50 mm 10 pcs Diamond drill: Diamond drills, or diamond trpans, diamond hole saw or reconstitute diamond drills. They are often dsigned under the name of glass drill or Tile Drill, but since they are used to pierce glass, cramic, porcelain, tiles, ceramic tiles, limestone, slate, marble, granite, stone and clear fiberglass, so they are more gnrale. Product characteristics:Matriau: steelLock diameter: 8 mm/0.8 cm, 10 mm/1 cm, 12 mm/1.2 cm, 14 mm/1.4 cm, 16 mm/1.6 cm, 18 mm/1.8 cm, 20 mm/2 cm, 22 mm/2.2 cm, 25 mm/2.5 cm, 50 mm/5 cmApplication: suitable for stone, tiles, ceramic, glass and granite processing. Good performance, long life. Perfectly suitable for glass and ceramic tiles make clean prcis holes. A drill works best (not included in the project). Instruction:1.Diagonal Start your hole, make a round of the brand, then drill it.2.Always use lubrication (water), or Diamond Drill brlera.3. through the bton and cutting tiles, it is very effective. There is the most heat and it will not damage the drill. Package Contents:10 x Drill