Thread-Locking Insert 1/4″-20 Inside, 3/8″-16 Outside

These inserts reduce at 3/8″-16 threaded hole to a 1/4″-20 threaded hole.
Use them to bolt two 1-2-3 blocks together. Use them to reduce the hole in 7/16″ or 1/2″ T-slot nuts to 1/4″-20 thread.
These inserts use Loctite adhesive to keep them in place. The adhesive reaches full strength after 72 hours.
Set the insert with a bolt and two nuts, or use a slotted screwdriver.