Features： 1、Neat Opening: Our diamond drill bit is able to make a neat opening that no extra trace will be contained on the material appearance, leaving a tidy work appearance. 2、Run Smoothly: This diamond drill bit has a small incision resistance with a fast hole opening. The chip is easy to remove. 3、Diamond Dust Coating: Plated with diamond dust coating, our drill bit has a better cutting ability and not easy to rust and corrosioin, comes with a long life span! 4、Easy Operation: The drill needs to be tilted at a 45 degree angle before it can be operated, easy for you to operate! 5、Wide Application: This hole saw can be used in different materials,like glass, wood, tile bottles, blocks jars, ceramic, slate mable, granite light stone, and other hard appearances. Specification： Item Type: Diamond Drill Bit Set Material: Steel, Diamond Dust Coating Size: Approx. 6 to 50mm/0.2 to 2in Package List： 1 x Diamond Drill Bit Set