We use these on all of out vises in the shop.  It WILL SAVE you so much time on setup.  You can set a vise on your machine table and have it aligned automatically within 0.003".  From them you can align better if needed.  This saves a bunch of time when doing multiple vises.  We have have a novice employee have 5 vises installed in a machine and aligned within 0.005" in under 10 minutes.  Removing and installing vises in no longer a chore!  We have 100's of satisfied customers using these.

- Used with Kurt 6 inch Vise- May fit others with a 11/16 (0.688") Vise slot width
- 11/16X 5/8 inch
- 1 package consists of 2 keys and 2 screws