Cup holder expander for keeping beverage cups and bottles secure while driving. Please do not over-tighten the base when installing into your vehicle's cup holder Crafted from durable ABS plastic, this cup holder is built to withstand rugged driving conditions, ensuring longevity and reliability. Featuring Flexible rubber grip tabs inside allow for easy cup and bottle placement and removal, preventing spills and tipping. Ideal for use in cars, trucks, SUVs, recreational vehicles such as boats, RVs, and more. Its expandable base adjusts to fit into most vehicles' cup holders between 2.5-3.75 inches. Not recommended for 2019-2023 RAV4, 2009-2018 Forester, 2020-2024 Outback models. Compatible with Yeti Ramblers (20, 26, and 30 ounces); Hydro Flasks (32 and 40 ounces); Nalgenes (30, 32, 38, and 48 ounces); Beverage containers between 3.4-3.8 inches; and most 32-40 ounce bottles; Note: does not fit Rambler 14 ounce mugs