Unrecycleable Symmetrix overburden casing system (Permanent )

Symmetric is a concentric drilling system with unrecycleable 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 market today.

The Symmetric components are made up of:
---A pilot bits with large internal flushing holes and external flushing grooves
---Symmetrical ring bit (reamer) with internal bayonet coupling
---Casing shoe for driving of casing.
The Pilot bits is attached to any common DTH hammer shank.

The Bloom symmetric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole.

Advantages：
Full face head designed for faster penetration and straighter hole
Less torque is required
Can drill in vertical, horizontal or any direction
Minimize disruption to the drilled hole
Varied ring bit diameters to suit different casing requirement