About this item: Diamond Drill Bit Set Sizes - Set include 10 holes saw drill bits+1 hole saw guide clamp+1 screwdriver driver + 4 triangle bit. 10 Sizes Diamond hole saw : 6mm, 8mm, 10mm, 12mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm,made of high-strength carbon steel, the integrated steel structure makes these diamond drill bits more durable. Diameter of triangle bit: 6mm, 8mm, 10mm, 12mm.Rustless & Durable: This diamond drill bits are made of high strength Carbon Steel with nickel plating surface. Each diamond hole saw coated with Diamond to enhance the drilling speed and creates a sharp, high precision and cut with no broken edges In Seconds. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.Adjustable Fixture - Adjustable hole saw drilling guide fixture with suction cup-the maximum opening length of the board is 3-1 / 4 inch, which is enough to fit in all size hole saws. Movable , two modes (fixing 3 or 4 bearings) are , just flip the board.The clearance holes along the drill bit help the entry of cooling water and the escape of chips and other particles from the borehole, ensuring punching and making the drilling process easier. Small holes-When debris gets stuck in the hole saw. use our screwdriver to pull it out. To provide you with the perfect experience.Wide Usage - This diamond-coated hole saw bit can be used to remove rings on glass, marble, tile, ceramic, PVC or other materials. When the diamond bit is working, please continue to add water to reduce the drilling speed, reduce the drilling pressure, and increase the water lubricity, which will greatly extend the life of the bit.Color: BlueMaterial: alloy steelPackage Contents:1 x Hole Saw Guide Jig Fixture10 x Diamond Coated Drill Bit4 x Ceramic tile drill bits1 x Screwdriver