• Helical cutterheads have carbide inserts mounted at a slight angle to the direction of the cut, creating a shearing action that many customers find produces smoother results.
• Spiral cutterheads have inserts mounted perpendicular to the workpiece travel. While the difference in performance may be subtle, most customers tend to prefer the helical style.

Both styles use carbide inserts, which are quieter than traditional high-speed steel (HSS) knives. Each insert has four cutting edges, allowing you to rotate or replace only the damaged inserts rather than replacing or repositioning full blades, saving time and money in the long run.