These bits are without a doubt the best bits I have ever used. I've worked with wood for 40 years and nobody has ever cut this solid white oak so smoothly without chipping. I started the project with a set of raised panel doors and a saver set of bits, the bits fried, ripped wood and were dangerous. When these bits appeared, the job became a lot easier and less dangerous. I highly recommend the 2+2 bits, the extra bits really help. These are quality bits that will last for many years with good care. The supplied CD gives a good overview of the correct application.