Slow Spiral Downcut Roughing router bits are used when roughing cuts are necessary. Roughing cuts allow for faster machining time to get material to size before finishing cuts are executed. The Slow Spiral geometry facilitates excellent cutting in hardwoods, solid surface, HDPE, LDPE, HPL and other hard plastics. Downshear router bits are preferred when chip evacuation is not required or downward force is necessary on the work piece. The common applications are sizing, trimming, and removing a large amount of material fast. Increase the number of flutes if fast feedrate is required. Used on 5 axis, point-to-point machines