Features: and high quality Good bracket with good primer. The upgrade board clip is for car holder air vent mount. Stable fix the air vent, 360 degree rotation. The diameter of the ball is 0.67 inch, fit for most car mounts and other air vent mounts in the market. (Please refer to the sizes strictly) This vent clip fits for Round / Square / Vertical air vents or vertical ones. Very steady. Four types for you to choose. Specifications: Material: Plastic Size A: Approx.4.2x8cm/1.65x3.15in Size B: Approx.9.3x9.3cm/3.66x3.66in Size C: Approx.7.6x10.3cm/2.99x4.06in Type: A,B,C,D(optional) Applies Outlet: Round / Square / Vertical Outlet Line Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Air Vent Clip Mount