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At ToolPlanet.com you get the best price on contractor grade wet diamond core drills and concrete core drill bits. For diamond core drill bits, you won't find a better selection or price than Tool Planet. Our diamond core drill bits run on core drilling machines and core drill rigs. Use our diamond core bits for wet diamond hole saw cutting. Our bits cut masonry or concrete including brick, block, asphalt, green concrete, field stone, pavers and cured concrete. Each diamond bit we sell is made to ISO 9002 quality standards so you know you are getting the highest quality wet coring diamond bit on the market. Our core bits come in whole and fractional sizes from 1 inch to 14 inches in diameter.