Permanent Symmetric Casing System by DTH Hammer

Symmetric Overburden System

The ProDrill symmetric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit （pilot bit）incorporated with a one time used 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.

Permanent Model (不可回收的）

The ring bit will be left in the hole after drilling finished.

Permanent Symmetric Casing System

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.

oncentric Casing System by DTH Hammer Technical Data:

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

For more details please watch PDF online:Permanent Symmetrix Casing System by DTH Hammer Catalogue