Diamond Hole Saw, Adjustable Punch Locator Tile Hole Saw with 11pcs Diamond Coated Drill Bits + 1pcs Screwdriver Hole Saw Guide with Suction Cup Base for Ceramic Glass[High Quality]This diamond drill bit is made of high quality steel, diamond powder coating to resist corrosion. The thickened diamond coating on the top provides excellent cutting resistance for smooth and high precision cutting without the need for hemming for optimal drilling results. [11 Sizes Diamond Hole Saw]This diamond hole saw set includes 11 different bits to meet your different needs. Includes the following diameters 5mm, 6mm, 8mm, 10mm, 12mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm, made of high strength 45 steel, the integrated steel frame makes these diamond tips more durable. [Adjustable Hole Saw Drill Guide] Fixing guide with suction cup base. The plates' maximum opening length is 4-83mm, large enough to fit all sizes of saw. Removable ball bearings have two models (fixed bearings 3 or 4) are optional for you, just turn the board over. [Ergonomic Design] The large safety hole on the drill bit allows cooling water to enter, prevents chips and other particles from discharging into the drill hole, ensures even drilling and facilitates the drilling process. Small hole: When debris is trapped in the hole saw. We can remove it with a screwdriver. This gives you the perfect experience. [Wide Use] This diamond hole saw can be used to remove rings from glass, marble, tiles, ceramics, PVC or other materials. When the diamond drill bit is working, continue to add water, reduce the drilling speed, reduce the drilling pressure, increase the water lubrication, and greatly extend the service life.