This router bit is COMPLETELY disappointing. As my tests showed, it cannot handle even the simplest woodworking projects. The bit easily broke during use, which is unacceptable for any tool claiming to be "industrial and scientific." The only pro is that it appeared to be made of durable material. Unfortunately that`s about all the good things I can say.The cons, however, are many. It's unreliable, expensive, and simply a waste of money..