shallow drills with 4D, Double helical inner coolant hole

1.Double helical inner coolant hole, better cooling and lubricating effect, larger range of drilling depth. 2.New shallow drill

. New shallow drills:

1.Pre-treated drill with high torsion resistance can support higher feed rate with higher efficiency.

2.Large chip pocket, good angle of chip flow, unobstructed chip removal.

3. Perfect insert assembling angle, low vibration during cutting, higher precision

and surface quality.

4. Double helical inner coolant hole, better cooling and lubricating effect, larger range of drilling depth.l

shallow drills with 4D, Double helical inner coolant hole