| ZRHG Series Concentric Casing System Technical Specifications | |||||||
| P/N | Out Dia. Of casing tube | Inner Dia. of casing tube | Reamed Dia. | Min. inner Dia. of casing shoe | Max out Dia. of DTH bit | DTH Hammer | |
| ZRHG168 | 168 mm | 148-155 mm | 184 mm | 140 mm | 140 mm | ZRC5 Series | |
| ZRHG178 | 178 mm | 158-165 mm | 194 mm | 148 mm | 148 mm | ZRC5 Series | |
| ZRHG183 | 183 mm | 163-170 mm | 198 mm | 156 mm | 156 mm | ZRC5 Series | |
| ZRHG219 | 219 mm | 199-206 mm | 231 mm | 188 mm | 188 mm | ZRC6 Series | |
| ZRHG273 | 273 mm | 251-257 mm | 300 mm | 241 mm | 240 mm | ZRC8 Series | |
| ZRHG series Concentric Casing System Features | |||||||
| Mainly used for geothermal and water well market, high efficiency, very stable, great hole straightness and time saving. | |||||||
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