gnuuser
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i use Irwin also and Vermont American, they are easily resharpened if needed and a little tip If you are drilling soft woods a lot they tend to get a bit gummy and dull quicker.
spray them with a good silicone spray lube. they will stay cleaner and hold an edge a lot longer.
spray them with a good silicone spray lube. they will stay cleaner and hold an edge a lot longer.