| http://www.w3.org/ns/prov#value | - When looking at these up close----the flutes as ground by Circofile/Thompson tool Supply do not have a nice smooth relief on the flutes and they are pretty crude compared to other burrs that I have previously boughten elsewhere---places like Mondello, BLP, etc.---so I do not know how well they will last particularly on cast iron or when cutting seat metal rings.
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