The Restrap Light Mount is a useful accessory that allows lights to be mounted to any M5 threaded eyelets, keeping your handlebars clear for mounting bags or other accessories.
By attaching lights to different spots like mid-fork, dropouts, or rack eyelets at the back of the frame, this keeps lights out of the way of luggage that could obstruct the beam. As a secondary function, it also serves as a tool to thread/unthread the crank bolt found on Shimano cranks.