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 crafted 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: triangular shank holds drill bits and prevent slipping.Strong carbide tip with sharp design can easily pierce different materials such as tile, concrete, brick, glass, plastic, wood, etc. Design Unique: The large passage holes on the drill bit make it easy for cooling water to penetrate and the escape of chips and other particles from the drill hole, ensure smooth punching and facilitate the drilling process.If dirt is stuck hole saw, we can take it out with our screwdriver. Wide Application: Diamond drill bits are suitable for glass, marble, tile, ceramic, wood or other materials. diamond drill bit is working, please keep adding water to reduce the speed drilling speed and drilling pressure, which significantly extends the life of the drill bit.