The Fingernail Piercing Tube is a device designed to puncture through the fingernail causing intense pain and lasting damage.


Tobaku Mokushiroku Kaiji

It is used by Ichijō to punish Kaiji when he is caught attempting to steal the money from the office of the casino while Sakazaki was causing a commotion by breaking the Bog.

Ichijō uses the device on each finger on the right hand of Kaiji.