3-1/2" Wet Diamond Core Bit, Supreme Gray - Granite, Hard Stones

The Professionals choice for drilling in hard stone and granite, all bits will take a 13" core (drill depth), from 1-3/4" and up the bits will have 1-1/4-7 thread.

For lack of a better term we describe these stone drilling diamond bits and Granite Bits.  Know however that they do very well drilling all hard stone and even some very hard concrete.