Two Piece Eccentric Overburden Drilling System
| A | E | C | D | |||
| System No. | Outer Dia. | Thickness | Reamed Dia. | Min. Inner Dia. of Casing Shoe | Hammer Type | Drill Pipe |
| K188 | 178 mm(7") | 13 mm - 19 mm(0.51")– (0.75") | 188 mm(7.4") | 144 mm(5.7") | DHD350QL 50, SD-5,COP52/54 | 76mm- 89mm(3") - (3.5") |
| K240 | 219 mm(8.62") | 12 mm- 15mm(0.47")-(0.59") | 240 mm(9.45") | 192 mm(7.5") | DHD360, QL 60,SD-6, | 114 mm(4.5") |
| K305 | 273 mm(10.75") | 16 mm-20mm(0.63")-(0.78") | 305 mm(12") | 238 mm(9.4") | DHD380,QL 80, SD-8 | 114mm - 127mm (4.5") - (5") |
| K360 | 323mm(12.7") | 20 mm - 24 mm(0.78") - (0.94") | 360 mm(14.17") | 284 mm(11.8") | DHD380,QL 8, SD-8/10 | 127 mm(5") |
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