Hey take a look at this DEWALT DW5903 3-Inch by 4-Inch Core Bit Body

DEWALT DW5903

I need to drill five inch round holes in solid cement. For a dry drill, this works quite well. It should be stated somewhere that this bit does require both the shank and centering bit, also, so there's an extra $75 or so. Also, this bit cannot do well in aggregate. Smooth cement and concrete it does quite nicely in, though. When you get to the maximum depth (about 3 inches) then pull the bit out and chisel out the initial cut, then you can finish drilling. I've gotten 20 holes out of it without resharpening yet.0 of 1 people found the following review helpful. Hardened steel body for increased durability ... »» Read more...

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