Integrated flange nut, and wide flange on one side, and the spinning washer.<br> The dispersion of the nut, the pressure reduces the risk of damage, which would reduce the possibility of loosely fixed makes a flat surface.<br> This provides the flanges serrated locking operation. This is because the saw-tooth angle, the direction of rotation of the nut, and the nut is loosened.<br> The serrated washer, and can be used on the surface of the wound. <br> To prevent this sawtooth oscillation of the nut, increasing the holding force of the nut.