2 In 1 Design: Our car cup holder is equipped with two storage cups, small in size and large in capacity, to save space in the carand hold two drinks at the same time. Can hold a cup, beverage bottle, cans, hand sanitizer, etc. Good Reliability: Four movable elastic clips of the cup holder can stably fix the water cup when the car is driving. Our cup holder for cars can effectively avoid the shaking and noise of the water cup. (Fits 5-7 cm Diameter Bottles) Extendable Base: Simply twist the top of the adapter to extend or retract the base. The diameter of the inserted base can be expanded from 6.6 -9.4cm to fit many different car cup holders and vehicles, such as trucks, motorcycles, ships, RVs, and golf carts. Removable Base Adjust Easily: Our car cup holder expander adapter is detachable. 3 Installation Methods. You can mount the base in the middle, left, and right. You can even remove the base and fix it on any flat place with the included double-sided adhesive foam.