Extendable base---insert base is expandable from 2.5"-3.94" in diameter to fit many different automotive cupholders and different vehicles,Just twist the top of the adapter to expand or retract the base. 2 In 1 design---universal detachable water bottle holder for cars.The bracket is equipped with two storage cups by adjusting the rotatable base, small in size and large in capacity, for the purpose of saving car space, and can hold two drinks at thesame time.Can hold cup, beverage bottle, cans, car ashtray. 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 5-7.5cm Diameter Bottles) Easy installation---Removable base adjust easily,aim at the buckle,To accommodate more cup holders of different models, The base adjustment car cup holder expander can be installed in the middle of the product, on the left or on the right even be stickon the instrument panel Widel application---Car cup phone holder has wide applications in daily life! It can be used in motorcycles, boats, trucks, RV's and golf-carts,You can use it to store many small items!