Features
1. Made of ABS, durable and sturdy. 
2. Soft and antiskid silicone mats inside, won't scratch devices and hold devices securely. 
3. Push the button on the back, the arms can extend to the width you need. (4.5cm ~ 7.2cm) 
4. Easy to install onto most bikes without need of any tools. 
5. Rotate screw to change diameter to fit for handlebar of different diameter. 
6. Suitable for mobile phone / PDS / GPS / MP4 / MP5 to fix on the bicycle.