This is a jig that help you to sharpen a 1.60mm rod at a 60 degrees angle at the end.

Hardware you'll need :

• 4x 608 bearing
• 4x M4x20 countersunk screws

Use a belt sander or turn upside down a regular sander, put the rod into a drill

It can be usefull to make an unclogger tool like this one : https://makerworld.com/en/models/84536

Many nozzles have a 60 degrees inside shape