Diamond Products Core Bore is one of the top brands in the Diamond Core Bit Business. With a wide range of quality grades you can get inexpensive bits or high performing long lasting bits and everything in-between all made with high safety standards in mind. Bit size range from ½” to 48” if you need special sizing, adaptors, parts, etc call Ohio Power Tool direct and get Diamond Products items as quickly as next day. Wet Core Bits can be used with hand held unit or rig mounted units. The Dry Core Bits are commonly used for bricks and concrete blocks and work with high speed grinders.