Sphere Bit, 2.2″, $369

This custom bit carves a half sphere from the top. Flip the ice to carve the second side of this sphere. Perfect 2.2″ spheres require a custom jig for accuracy. Bit is designed to be used up to 10,000 rpm. Works well with low rpm drill presses. If using this bit on a CNC router or spindle, be sure speed is below 10,000 rpm.