Cup Holder: The expandable base can be adjusted from 2.6 to 3.8 inches in diameter to fit different types of automobile cup holders. Simply rotate the adapter base to extend or retract the base and it can be firmly fixed on your car cup holder. Removable base, the base can be centered and offset for different car cup holder positions, side by side or front to back, improving the use of two cup holder bases. Shrapnel and Silicone Coaster: The silicone insert of the car cup holder can make cups easy to put in and take out of the adapter. The coaster can ensure that the cup is fixed in the cup holder when driving, will not shake or fall, and avoid friction of the bottle body. U-shaped slot: This design is very convenient that cups or mugs with handle can be perfectly placed in this car cup holder without tilting or splashing. We still offer a one-year warranty. Suitable for different sizes: The silicone shrapnel allows the adapter to work with 2.9-3.88 inches diameter bottles/cups.