This special large ending for expandable baton can replace the original ending supplied on the ESP batons.
It increase greatly the certitude of baton holding. This ending has a specially curved jut, which allows hitting the adversary with the other side of baton.
This is advantageous in situations where a confined space makes it impossible to fully open the baton and use it.
In this case, the ending is sold separately as an accessory to complete expandable baton.