Extendable Base 2.5"-3.80" The cup holder insert is expandable from 2.5"-3.80" in diameter,so you can expand it to fill the console cup holder for different vehicles, It works great for golf carts, boats, and trucks, Our extra thick pads on the expanding base ensure the adapter stays securely in your cup holder. Two U-Slot For Container With Handles The Large U-slot Iis easy to remove the cup holder from the slot. And the cup holder has a base deep enough to provide a great balance for your water bottle. Easy to Install Not suitable for Tesla,Just hold the base and twist the top, the base will then retract or expand,you can adjust the cup holder to the most stable state. Container With Handes It is easy to remove the cup holder from the slot. And the cup holder has a base deep enough to provide a great balance for your water bottle.