1. F4 is compound sharpener of drill & end mill. can sharpen the front cutting edge (front angle), top angle (tip angle), back
angle (escape angle) and back of the drill bit. The size of the center blade can be adjusted to make drilling easy and chip
removal easy.
2. F4 can sharpen 2 flute, 3 flute, 4 flute end mill, customized can also be used to directly open the end face cutting edge. 5
flute can be customized.
3. F4 can sharpen the end mill bottom edge, the first bottom edge back angle, the second bottom edge back angle, the center angle (bottom edge inverted cone), the bottom edge front angle, the center slot. The core angle is adjustable from 0° to 3°.