Cup Holder: The expandable base can be adjusted from 6.6 to 9.7 cm in diameter to fit various types of car cup holders. Simply rotate the adapter base to extend or retract it, and it will securely attach to the car's cup holder. The removable base can be centered or offset for different positions of car cup holders, side-by-side or front-to-back, improving the use of two cup holder bases. Silicone Insert and Coaster: The silicone insert makes it easy to insert and remove cups from the adapter. The coaster ensures that the cup sits securely in the cup holder while driving, preventing it from shaking or falling, and preventing friction against the bottle body. U-shaped Notch: This design is very convenient, allowing cups or mugs with handles to be perfectly placed in this car cup holder without tipping or spilling. We always offer a one-year warranty. Suitable for various sizes: The silicone explosive allows the adapter to work with bottles/cups from 7.4 to 9.8 cm in diameter. The extended cup body fits taller and larger cups, is more stable and less prone to wobbling, and fits most water bottles from 591 ml to 1134 g.