Probably the most dangerous bit I have ever used. The first time I used this attachment to join multiple pieces of soft maple it failed in the most startling and spectacular way. When I put my third piece through the cutter, 3 of the 8 carbide teeth broke off and 3 pieces of carbide were thrown out of the cutter. The resulting compromised bit resulted in an equally impressive board bounce. Luckily, I escaped relatively unscathed. I currently have several other Yonico bits, but at the moment I'm not sure I can trust them. In this case, the security is definitely worth a few euros more for another manufacturer.
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