Abstract: A mechanical tonfa with a spring-loaded swiveling and locking mechanism. The tonfa includes a main bar with a perpendicular handle. The handle includes a button that engages a spring-loaded locking bar within the handle. The portion of the main bar that connects to the handle includes a circular groove that fits over a circular protrusion on the handle. The main bar also includes an aforementioned plurality of notches, enabling the main bar to lock in multiple positions. When the button is pressed, the locking bar is moved such that it is removed from one of the notches, enabling the main bar to swivel relative to the handle. When the button is released, the force of the spring causes the locking bar to return to its original position, causing the main tonfa bar to lock in one of multiple positions depending on the positions of the plurality of notches.