The Twist "n" Lock Spring-Grip Rubber-Lip Car Mount for the Samsung Galaxy S4 Active is constructed with a rigid 13cm (5.12") arm which acts to reduce vibration as well as giving extra reach for deep windshields. The twist "n" lock mechanism on this mounting option provides a secure grip onto the glass of the windscreen. The 70mm (2.75") diameter suction cup has a release tab for easy removal. The smartphone cradle is stylishly lined with red rubber which protects the phone along with providing a secure grip. This holder is spring loaded which enables the phone to wear an additional protective case or skin if necessary. The ball and socket joint on the back of the cradle provides 360º rotation - ideal for positioning the phone vertically / horizontally for GPS and map applications.