B-56 Impregnated Diamond Core Bit

Size B-56 Design Metric
Outer diameter MAX (mm) 56.13 Outer diameter MAX (in) 2.210
Outer diameter MIN (mm) 55.88 Outer diameter MIN (in) 2.200
Inner diameter MAX (mm) 51.81 Inner diameter MAX (in) 2.040
Inner diameter MIN (mm) 51.56 Inner diameter MIN (in) 2.030
Hole diameter (mm) 56.5 Hole diameter (in) 2.22
Core diameter (mm) 45.2 Core diameter (in) 1.78
Hole area (cm2) 24.9 Hole area (in2) 3.86
Core area (cm2) 16.0 Core area (in2) 2.48