Ball Nose with Center Cutting: The center of the ball head has cutting ability and can perform oblique downward cutting or shallow cavity milling at a certain angle, making it more versatile. (This type is preferred)
Non center edge ball cutter: The center of the ball head has no cutting edge and can only perform lateral milling.
Cone Ball Nose: The blade has a taper, the ball head is smaller, and the handle is thicker. Combining strength and the ability to process deep cavities and narrow seams, it is extremely common in woodworking reliefs.