Single-edged milling cutters have low cutting efficiency because one blade is less at the same speed
But the surface finish is good, because a blade is definitely not pitted.
Double-edged milling cutters have high cutting efficiency, but the machining surface may be slightly worse due to the difference in cutting angle and cutting height between the two blades.
Application : Harder materials such as PVC, MDF, plywood, solid wood, etc.
Advantage: Large chip removal, sharp edge, smooth cutting, high engraving speed and high efficiency .