Parrot - AR.Drone 1 Screws
Three types of screws are used in the AR.Drone.
The one with the slices are used to attach the main board and the navigation board on the body set. The longer screws secure the motor’s electronic controller to the central cross and the shorter screws secure the motor itself on the central cross.
Warning : This product is only compatible with the version 1 of the AR.Drone and is not compatible with version 2.