As an industrial and scientific user, i purchased this router bit for a specific job .As a result of my tests, I determined that the Kempston 202011 Groove Cutting Diameter was not up to par. It broke after only one use, leaving me in a bind and unable to complete my project on time. The only pro I can give is that it did initially fit my router, but that`s not enough to make up for its poor durability. Overall, I would not recommend this product for cutting tools..