This reamer countersink was a complete waste of money. Through trial and error, I found that it didn't work well on any type of material I used it on. It felt like something I'd pick up at a dollar store, not from an industrial and scientific supplier. The only pro was that it was relatively cheap, but the cons far outweighed any potential cost savings. I would not recommend this product to anyone in need of a reliable reamer countersink.
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