I spent hours deciding on a set of bits for the grand piano. Having never collected sashes before, I didn't know what to look for. If you have specific inventory needs this is where you should start as some bits are adjustable and others like this set for a very specific inventory size. Be sure to route the material so that it is the same thickness or things will not line up properly. I chose this set because I have always been happy with my Freud bits and needed a set so I didn't have to disassemble and reconfigure the setup between rails and rungs as separate bits require. I have nothing to complain about with this set and would recommend it.