The Nicholson American-pattern Single-cut Bastard Round File is primarily designed for sharpening circular openings or concave surfaces.
- Primarily Used to File Circular Openings or Concave Surfaces
- Tapered Slightly Towards Point
- Single Cut
- Tapered tang accepts for use with an optional handle
| Size (Cutting Length) |
Small Diameter |
Large Diameter |
Overall Length | Nicolson # |
|---|---|---|---|---|
| 6″ | 5/32″ | 1/4″ | 7-7/8″ | 21846 |
| 8″ | 3/16″ | 9/32″ | 10-3/16″ | 21853 |
| 10″ | 7/32″ | 3/8″ | 12-1/2″ | 12019 |












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