Downcut Chipbreaker Router Bits are used when the top surface of the material needs to have an excellent finish. The Chipbreakers assist in reducing the size of the chips during cutting and is most effective during the cutting of plywood. The common applications are grooving and pocketing. Increase the number of flutes if fast feedrate is required. Great for Plywood. Used on point-to-point machines. 6% Cobalt is a carbide grade best suited for HPL and composites, 10% Cobalt is a Carbide Grade best suited for solid wood. Tools last longer when paired correctly.