Multiplier Drill Bit: This set includes 10 drill bits to meet different requirements, including 6mm, 8mm, 10mm, 12mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm. The diamond hole has been finely worked and wear-resistant, the advantages of no chipping, high speed, sharpness and wear resistance.Adjustable Hole Saw Guide: You don't have to worry about scratching your tiles when drilling the hole. Our Adjustable Hole Saw with Suction Cup is suitable for all size hole saws up to a 3-1/4" hole diameter.Non-slip: The triangular shank helps hold drill bits and prevent slipping. Sturdy carbide tip with pointed design can easily pierce different materials such as tile, concrete, brick, glass, plastic, wood, etc.Unique Design: Large through holes on the drill bit make it easy for cooling water to enter and chips and other particles to escape from the drill hole, ensure smooth punching and make the drilling process easier. If the dirt is stuck in the hole saw, we can remove it with our screwdriver.Wide Application: Diamond drill bits are suitable for glass, marble, tile, ceramic, wood or other materials. When the diamond drill bit is working, please keep adding water to reduce the drilling speed and drilling pressure, which greatly extends the service life of the drill bit.