Universal Adjustable Cup Holder Expander with Slim Phone Slot Key benefits Universal, secure fit: Expands and locks to fit most standard round car cup holders (fits 66–100 mm base). Twist the and bottom in opposite directions to securely lock the expander in place. Holds large and awkward drinkware: Extrawide opening and Ushaped side cutout accommodate extralarge tumblers, big water bottles, and handled mugs that don't fit standard holders. Keeps essentials organized and accessible: Builtin slim slot holds a smartphone and other flat items such as cards, keys, or coins so your console stays tidy. Stable and quiet on the road: Nonslip base pad plus secure rubber grips keep drinks upright, reduce rattle and movement, and minimize the risk of spills on bumpy roads. What it does for you Solves fit problems: No more loose or tilted cups — the expandable base adapts to common cup holder sizes and locks firmly in place. Makes space for larger bottles and mugs: The extrawide design and Ushaped side opening allow you to use handled mugs and oversized bottles without forcing them into a small slot. Improves convenience: Phone and smallitem storage keeps important items within reach and prevents clutter in the console area. Reduces noise and mess: The nonslip pad and rubber grips dampen vibration and movement, producing a more stable, quieter ride. Features and specifications Adjustable base range: fits cup holder bases 66–100 mm Installation: twist and bottom in opposite directions to expand and lock Extrawide holder with Ushaped side opening for handled mugs Builtin slim slot for smartphones and flat items (cards, keys, coins) Nonslip base pad and rubber grips for stability and rattle reduction Practical use scenarios Daily commute: Securely hold a travel mug while keeping your phone visible and accessible for navigation or hands calls. Road trips and errands: Use the expander for large water bottles and tumblers, and keep small items organized so they won't slide around the console. Rideshare or multidriver vehicles: Quickly adapt the cup holder to different sized drinks and provide passengers a stable place for handled mugs or oversized bottles. Materials, care, and compatibility notes Designed for most standard round car cup holders with a 66–100 mm base. Follow the twisttolock installation for a secure fit. Clean with a damp cloth as needed.