Wide Compatibility: This vent clip fits for eigher horizontal air vents or vertical ones. Very steady. Easy to install: It can rotate 360 degrees, and can clamp 10.5~38mm blades. Universal Ball Joint: The diameter of the ball is 0.67 inch, fit for most MOKPR car mounts and other air vent mounts in the market.(please refer to the sizes strictly). Free to Adjust: This air vent grip adopts rotating operation, you are free to rotate it to fit for your vent boards. You don't need to worry about the thickness of the vent. More Stable and Secure: After installing, the three boards of blind will lock the clip. This makes the clip never jump or fall off.