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Descriptions:Diamond coating maximizes performance and retains a sharper cutting edge than traditional carbide or bi-metal hole saws.Smooth and exact finish can lower incision resistance, drill pressure, and increase the sharpness, effectiveness of water lubrication.Nickel plating on the bits maximizes tool’s life, and provide good resistance to corrosion. Excellent for making clean and precise holes on glass or ceramic and extending drill bits life.Diamond drill bits with clearance hole facilitate the entrance of cooling water and escape of chips and other particles from drilling. Makes drilling process easier.Suitable for processing Stone, Tiles, Ceramics, and Glass etc.. Works better with a electric drill packing :1 pack of 1pcs