Drill Bits

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Diamond Drill Bits for Granite, Mable, Glass & Stone

The Diamond Tool Store offers a wide variety of diamond core drill bits, including bits for Granite, Masonry/Concrete, Marble, Porcelain, Glass and even Metal. We stock core bits for both wet and dry use. Our entire line of bits are of the highest quality, including high diamond concentration and high-quality laser welding for all diamond segments of each bit. We offer continuous rim, turbo bits where fast cutting and a smooth finish are required; we have non-core bits where blind holes are called for.Our entire core bit selection comes with 5/8-11 threading: standard for most grinders and wet polishers.  We have adapters to allow our bits to be used with an electric drill motor. For longest life always operate your core bit at the recommended RPM speed!Our bits for natural stone can drill a hole up to 3 ½" in depth; our Masonry/Concrete bits can drill up to 12” deep. 
Need to go a little deeper? We also offer shaft extensions that allow coring up to an additional 12" in depth. We have available bit diameters from 3/16" to 14", and can make a custom bit for whatever diameter you require. 


Core Drill Rigs

Angle Grinders Hand Polishers Air Polishers


Dia Plus Free Maxima