Expanded cup holder diameter: enlarges the original cup holder to accommodate larger diameter cups and drinks up to 4.13 inches in diameter, making full use of the car's existing cup holder space without occupying other areas and increasing driving convenience. Rotating, adjustable base: the base can rotate and adjust, with a telescopic diameter of about 2.55 to 3.93 inches (65 mm to 100 mm), suitable for the normal cup holder calibers of most cars. This extender only increases the height of the original cup holder and does not affect normal driving. waterproof material: made of waterproof material, resistant to and low temperatures. Exquisite workmanship and fine texture, will not scratch the cup body, and the smooth surface is easy to wipe clean. Reusable. The base is made of non slip silicone to ensure stability. Easy to install: the bottom features a three claw groove design and can be fixed in the cup holder by rotating. With strong bite force, it will not pop out easily. Installation is simple and requires no tools. Use scenarios: On long trips or daily commutes to hold large coffee cups or bottles up to 4.13 inches in diameter. In vehicles with standard cup holder calibers that need support for taller beverages without blocking access to other controls. In shared cars or family vehicles to accommodate different cup sizes and beverage containers, keeping the cabin organized.