ITEM NAME:1X(20 Pieces Diamond Holesaw Drill Bit Set For Glass, Tile, Jewelry Diy, ExN8K9) 1X(20 Pieces Diamond Holesaw Drill Bit Set For Glass, Tile, Jewelry Diy, ExN8K9) 1X(DIMENSION:3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,12mm,14mm,16mm,18mm,22mm,25mm,30mm,35mm,40mm,45mm,50mm;20 sizes to meet your different needs. The bit's tip head is made of 80 grit diamond coating, which is uniform; It great helps to increase the drilling speed and more sharper than other ordinary hole saws. APPLICATION - Suitable for use in drill hole on glass, marble, tile or granite; Will work with all electric drill and impact drill;Not suitable for tempered glass and concrete. When drilling must add water to cooling and lubrication, Which can extend the life of the drill bit set. NICE DESIGN - The center pilot holes and side holes help to remove the waste material easily; Using laser-marking, the brand name and size are more clear and beautiful; And surface nickel plating, extend the service life, enhance the surface corrosion resistance. NOTE:When cutting hard materials it is important to ensure the cutter is kept cool to avoid damage to the material being drilled and premature wear of the cutter; Water is required for lubrication when drilling, which can extend the life of the drill bit set. Cutting Depth: 1/2 inch (12.7 mm). Color: silver Material: diamond, iron Side holes: Allow for easy slug removal after drilling. Nickel plating on these bits maximizes your tool's life with great resistance to corrosion. Well suited for : Lithium Drill, AC Drill, Hammer Drill, Drill Press and so on. Suitable for for Drilling Glass,Tile Bottles, Blocks Jars, Fiberglass Porcelain Tile Ceramic, Slate Mable, Granite Light Stone, etc. How to drill correctly？ 1.Use pen to make a circle. 2.Start hole at an angle of 45 °slowly. 3.Make a round trace and then hold drill straight. 4.Slow speed down for exit hole or drill from the other side from the other side to prevent breakthrough. 5. Be sure to add water)
