These blades have a number of reverse teeth that produces a splinter free finish on the top of your work, and on the bottom as well. This 13cm long blade is hardened, and great for aggressive fast cutting in hardwoods. The number of reverse teeth varies depending upon the tpi of the blade and is indicated in the selection list. The finer tpi have more reverse teeth than the coarser tpi blades. Twelve blades per package. Made in Germany.