Glass Tile Marble Hole Drilling Bit Set

These Drill Bits are of high quality and good performance that excellent for making them clean and accurate hole. Nickel-plated with a diamond dust coating offers superior performance and cutting strength. Extended service life. These diamond drill bits are made of high-speed steel which is durable and has a long service life, which is of high quality and good performance, excellent for making clean and precise holes. Tile Marble Holder reduced drilling speeds, low drilling pressure, and increased use of water lubrication will greatly extend the life of the bit.  Each hole is treated with a smooth and precise surface treatment, and the top of the hole is thick for excellent cutting resistance. This diamond-coated Drilling Core Bit removes a full circle of glass, marble, tile, granite, ceramic, or others. They are perfect for drilling glass, tile bottles, jar blocks, fiberglass, porcelain, ceramic tiles, slate, clear granite stone. KEY FEATURES: Excellent for making clean and precise