The current invention discloses a drill bit assembly with a body portion intermediate a shank portion and a working portion. A satisfactory high glossy toner image is stably obtained with no image inferiority while conveyance of the recording medium. The transmitter is adapted to modify the transmission of the acknowledgment message if the check processor determines that the data unit has not been correctly received. A fastener for securing the damper rod to a vehicle is also provided. The tunneling magnetoresistive stack exhibits a negative exchange coupling between the first ferromagnetic layer and the second ferromagnetic layer indicating that the tunneling magnetoresistive stack has a high quality tunnel barrier layer.