Surprised at Their Quality
I've alway considered Irwin to be once removed from junk. But these appear to be pretty good bits. I'll write again once I've had more experience with them. I'd like to mention that I emailed Irwin to ask them what kind of steel the bits are made from and they replied that they are High Speed Steel. It would be interesting to find out what alloy. In any case the finish and grind are very good. Above 3/8 the bits have hex flats growned in their shanks. This could affect concentricity but it also prevents slippage in a chuck. I like the hex shanks as they make a perfect accessory for todays keyless chuck drills. Now I bought this set from Amazon when they had a half price sale. The bits are made in China but sadly they seem to be a quality product and at half price they were a bargain.More detail ...
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