Specification? Material: Plastic / silicone band Color: Black-Red Weight: 109g Suitable handlebar Diameter: 0.6-1.2 inch (15-30mm) Holder Size: 0.6-6.3 inch (15-160mm) Instruction: Install the bike handlebar mount on your bike tightly. Then attach the 360 rotating tighten screw and the clip on the mount.(Which you can adjust the display to the most convenient position) Finally,put your cellphone onto the special stretch clip, which can safety lock your device. Fit for bicycle/motorcycle handlebar 15-30mm. No tools required needed and easy to install. Quick release,Screw fixed, easy to install,prevent your device from dropping. Special stretch clip design for safety lock, strengthen locking function, keeps your device more secure. 360 degrees rotating allow adjusting the display to the most convenient position. Compatible for device up to 6.3 inch screens, such as mobile phone, MP4/MP5, GPS, PDA etc. Package Include: 1 x Bicycle phone holder with strap (strap color may vary)