Double tube surface | ||||
Size(surface exploration drill) | Metric system(mm) | Imperial system(in) | ||
Hole diameter | Core diameter | Hole diameter | Core diameter | |
BQ | 60 | 36.4 | 2.36 | 1.43 |
NQ | 75.7 | 47.6 | 2.98 | 1.88 |
HQ | 96.1 | 63.5 | 3.78 | 2.5 |
PQ | 122.7 | 85 | 4.83 | 3.34 |
Triple tube surface | ||||
NQ3 | 75.7 | 45 | 2.98 | 1.78 |
HQ3 | 96.1 | 61.1 | 3.78 | 2.41 |
PQ3 | 122.7 | 83 | 4.83 | 3.27 |