Symmetric Overburden Casing System Drilling Tools

Symmetriccentrexsymmitrix drilling system
symmetric is a concentric drilling system with retrievable pilot bits.
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.
Assembly code hammer drill pipe dia.(mm)
tgz75-3.5-1087.5 dhd3.5 76
tgz80-3.5-1146 dhd3.5 76
tgz90-3.5-1276.5 dhd3.5 76
tgz103-340-1406 dhd340a 76
tgz106-340-1467.5 dhd340a 76
tgz121-350-16810.5 dhd340r 76 89
tgz130-350-1688 dhd340r 76 89
tgz136-350-1789 dhd340r 76 89
tgz139-350-18310 dhd340r 76 89
tgz148-360-1946.5 dhd360 114
tgz163-360-2197 dhd360 114
tgz163-360-21912.5 dhd360 114
tgz218-380-27311.5 dhd380 114 140
tgz218-380-2736.5 dhd380 114 140
tgz253-110-3249.5 dhd110 140 194
tgz338-112-4069.5 dhd112 194 273