1. The correct way to hold the Adel Nibbling Tool

2. The sheet metal (or plastic) is placed in the gap between the punch and channel

3. By squeezing the lever  the punch will move down into the channel nibbling out a slug of metal

4. To make a sharp 90 degree turn, pull the tool out of the slot . Turn the work 90 degrees and re-insert the tool again then cut

5. By turning the Adel Nibbling tool before each cut, a 5/16" radius (min.) can be cut

6. Any shape or size hole can be cut with the Adel Nibbling Tool by starting with a 7/16" hole