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Old 12-29-2018, 04:17 AM
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Lu47Dan Lu47Dan is offline
Connoisseur of Old Iron
 
Join Date: Mar 2006
Location: N/W Pa.
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I would buy the carbide tipped hole saw but not Dewalt. Buy a Champion CT5 in the correct size you need. I have not had much good luck with Dewalt drills bits and saw blades. On the other hand the Champion CT7's I have bought are still going strong.
Use a good drill motor and a little care the CT5 will last many times the number of holes you have to drill. Keep the rpm's reasonable for the size of hole you are cutting also.
I have not used oil on thin metal, but on thicker stock I do use cutting oil.
Dan.
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