While looking for a router that would do the job, I came across this spiral router. It has two flutes and is in 1/4 time. This racket is made of FULL CARBIDE AND NANO BLUE COATED material. With the carbide and blue coated guard I hope this bit will last a long time. I had breaks only to find that the RPM needed to be adjusted after fine tuning fixed the issue. The cutter is supplied in a plastic case for protection. I'm sure this cutter will come in very handy for anyone who needs a spiral cutter. In general I am satisfied with this product.