Marble Hole Drill Bit

Hole bits or core bits are specially designed drill bits that are tipped with either diamond or carbide. Rather than relying on channel action like normal bits core bits have a central pilot bit that holds the bit in place while the outer sections of the bit cuts a hole through stone. These core bits are made up of a concentration of diamonds and metal bonds in order to cut the hard surface of the granite.

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It leaves a cylinder shape which often is used as sink holes or to feed lines and pipes.

Marble hole drill bit.

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