With up and down swivel head. Used to low profile attach your SP Connect(tm) Phone Case to most mirror stems or handlebar crossbars. The simple 90 degree 'Twist to Lock' mount, in a vertical or horizontal orientation, allows 360° rotation. Comes with inserts to fit 10mm (0.39") to 16mm (0.63") diameter round bar. Note: If you are using a smartphone with a mechanical image stabilizer, we recommend the use of the Anti Vibration Module (599508/599509), to prevent possible damage to your phone's camera from vibration.