B-86 Impregnated Diamond Core Bit
| Size | B-86 | Design | Metric |
| Outer diameter MAX (mm) | 86.13 | Outer diameter MAX (in) | 3.391 |
| Outer diameter MIN (mm) | 85.88 | Outer diameter MIN (in) | 3.381 |
| Inner diameter MAX (mm) | 71.83 | Inner diameter MAX (in) | 2.828 |
| Inner diameter MIN (mm) | 71.58 | Inner diameter MIN (in) | 2.818 |
| Hole diameter (mm) | 86.6 | Hole diameter (in) | 3.4 |
| Core diameter (mm) | 71.7 | Core diameter (in) | 2.82 |
| Hole area (cm2) | 58.5 | Hole area (in2) | 9.07 |
| Core area (cm2) | 40.4 | Core area (in2) | 6.26 |
