Dia. 108mm - 406mm for DTH hammer 3" to 10"

Symmetric Drilling System is designed to drill and case a hole simultaneously through
unstable ground conditions. The driver bit incorporated with a sacrificial 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 bottom of the drilling hole, and thus minimising the
disruption of the surrounding of the drill hole.

Futures

Straight Holes and Fast Penetration Rate.
Less Torque in all ground conditions.
Easy System to lock and Unlock Ring.
Drilling at any angle required.

Symmetric Casing Drilling System consists of three parts: Polit bit, Casing shoe and Ring bit.

Product specifications: Symmetrix system