Symmetric Overburden Casing Drilling System with Ring Bits

Symmetric Overburden Casing Drilling System with Ring Bits

A driver bit and a ring are assembled to a complete concentric system bit which is suit for 114-1067mm diameter tube. 

Advantage: 

1. Enhance penetration and perpendicularity

2. Reduce torque requirements

3. Deal with straight, oblique hole and other angle holes

4. Lowest effect with environment