Simple and rapid opening and closing of the clamp with the clever screw plug. Mount the clamp at the grille of the vent and fix it at the desired position by tightening the screw. To remove or lock the holder, open the clamp. The rubber surface on the inside provides extra grip and the surfaces are protected from scratches.
For avoiding of holder damages always open the screwing to adjust the ball joint. If the desired adjustment of angle is reached, close the screw of the joint to fix it.