The car cup holder adapter offers wider adaptability and stability for holding big-size cups. It can hold bottles, cups, mugs, etc. with a diameter of 2.4"-3.7" or 8-40 OZ. It is easy to use and install, requiring no tools and the rubber tabs can be removed for larger cups. This cup holder expander is a must-have accessory that makes the original car cup holder more compatible, and it also has a pending patent.