Designed for fast, efficient coring, the Milwaukee® Contractor 3" Diamond Core Bit has an optimized diamond matrix to provide value in coring fewer holes in cured concrete with no reinforcement or with small diameter steel mesh and rebar. This general purpose bit produces fast, efficient holes at a lower cost, making it a solid choice for repetitive coring or when difficult drilling conditions may damage premium bits. The bit effectively cores both concrete and asphalt. Available in diameters 2" to 6" with a thread size of 1-1/4"-7, Milwaukee Contractor Diamond Core Bits conform to Diamond Core Drilling Manufacturers Association Contractors.