Use in handpieces and in hand grinders for holding items such as felt wheels, brushes, etc. For use with Pumice, Cratex, and other wheels that have a maximum thickness of 1/4".
Threads are right-hand. These mandrels sold in packages of 3 Except for "I" (840-3115) which is Each
| Style | Shank | Arbor hole | |
| A. | 321 | 3/32" | 1/16" |
| B. | 321-1/2* | 3/32" | 1/16" |
| C. | 304 | 3/32" | 1/16" |
| D. | 2 | 3/32" | 1/8" |
| E. | 311 | 1/8" | 1/16" |
| F. | 20 | 1/8" | 1/8" |
| G. | 22 | 1/8" | 1/8" |
| H. | 24 | 1/8" | 1/4" |
| I. | 25 | 1/4" | 1/4" |









