Round shank. Hardened cutting edge - milled clearing hole.
Variety of sizes.
The use of an Osborne wooden mallet or rawhide hammer is recommended. Steel hammers are not recommended.
| Osborne No. | Size | Hole diameter (in) | Weight each (oz) |
| 245 0 | 0 | 5/64 | 1 |
| 245 1 | 1 | 3/32 | 1 |
| 245 2 | 2 | 1/8 | 1 |
| 245 3 | 3 | 9/64 | 1 |
| 245 9 | 9 | 1/4 | 1 |
| 245 11 | 11 | 9/32 | 3 |
| 245 14 | 14 | 3/8 | 4 |
| 245 16 | 16 | 7/16 | 4 |
| 245 1/2 | 1/2 | 1/2 | 7 |
| 245 5/8 | 5/8 | 5/8 | 9 |
