B-146 Impregnated Diamond Core Bit
| Size | B-146 | Design | Metric |
| Outer diameter MAX (mm) | 146.18 | Outer diameter MAX (in) | 5.755 |
| Outer diameter MIN (mm) | 145.80 | Outer diameter MIN (in) | 5.740 |
| Inner diameter MAX (mm) | 131.90 | Inner diameter MAX (in) | 5.190 |
| Inner diameter MIN (mm) | 131.80 | Inner diameter MIN (in) | 5.180 |
| Hole diameter (mm) | 146.5 | Hole diameter (in) | 5.76 |
| Core diameter (mm) | 131.7 | Core diameter (in) | 5.19 |
| Hole area (cm2) | 168.1 | Hole area (in2) | 26.06 |
| Core area (cm2) | 136.2 | Core area (in2) | 21.12 |
