Concentric Overburden Casing Advancement System With Retrievable Pilot Bits

Concentric overburden drilling system O.D.194mm;Symmetric Overburden Casing Drilling System Symmetric/Centrex/Symmitrix Drilling System Symmetric is a concentric drilling system with retrievable pilot bits. Permanent Model The ring bit will be left in the hole after drilling finished. This system drills in any direction and in any type of ground condition. It is, in fact, the most flexible and efficient overburden system on the markettoday. The Symmetric components are made