I love using these while grinding!  They help protect my fingers and nails.  Its also great to use if you suffer from arthritis, neuropathy or carpal tunnel which is why I am so happy to be able to offer these as well.  Another very useful tool to have in your toolbox and one that you will use all the time.  Comes with 1 set of replacement jaws.
 
Use: Rubber jaws hold glass while grinding,
Features:
- Makes grinding faster, easier, & more accurate,
- Protection for fingertips & nails,
- Wide base keeps glass at right angles to the grinder head.
- Accepts glass from 1/8" up to 1/4" Thick