1.Ball-and-socket style for easy clip and adjustment.Allows the GPS to be easily angled into the desired viewing angle.17mm diameter ball head compatible .Ball-head DiameterBall Socket Suction Cup holds firmly on to your windshield, providing a stableviewing environment. 2.Extra GPS mounts are the perfect solution for moving your navigation system from one vehicle to another with the least amount of hassle. 3.Never lose your way. Keep your GPS with you at all time with this windshield suction mount. Just stick the mount to your windshield with the suction cup and lock it in place. quantity of delivery:1 piece (Package contents: Only the above package contents, excluding other products.) size:6.2*5.6*9CM (Reminder: The size is measured manually, please allow 1-2 cm measurement error) color:black colors (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.) Products from LUOLV's store