Large diameter centering/adjustable U-drill

1. High hardness base material is sturdy and durable
The use of high hardness spring steel to build, anti-corrosion and anti-rust toughness, rigidity, and greatly extend the service life.
2. Convenient and efficient design of the inner water outlet hole
Internal water outlet hole design, within the better and more effective cooling blade processing automatically and continuously into the knife without the need to back out, more convenient
3. Precision crafted to fit closely
A variety of parts can be replaced, the combination of seamless, to prevent vibration of the knife phenomenon, improve precision