【EXPANDABLE BASE FOR 2.5'' -3.75'' DIAMETER CAR CUP HOLDERS】-The expandable base expands to fit 2.5"-3.75" diameter car cup holder, which is ideal for various vehicles including SUVs, trucks, boats, golf carts and RVs. (Note: May not fit certain compact car models with uniquely shaped or angled cup holders) 【Smart Space-Saving Design】- Features an adjustable base that can be customized with a screwdriver to fit around center consoles, gear shifters, and other vehicle features. The compact design maintains full vehicle functionality while securely holding your drink. 【Secure & Rattle-Free Hold】- Equipped with 4 reinforced non-slip grips and a specially designed slot to firmly hold large bottles. Includes a vibration-dampening coaster to prevent noise and keep drinks stable, even on rough roads. 【Universal Fit for Large Bottles (3.4"-4")】- Works seamlessly with most popular insulated tumblers and water bottles in the 3.4"-4" diameter range. Compatible with Yeti Rambler series, Hydro Flask wide mouth, Stanley Quenchers, and other large diameter drinkware. Perfect for daily commutes, long drives, or outdoor activities. 【Quick & Tool-Free Installation】- Easy to set up by simply rotating the cup holder until secure. Made from durable, high-quality materials for long-lasting performance. Can be easily removed or transferred between vehicles. MS MASTER SHOW Car cup holder expander Specification: Made of high-quality ABS, Master show car cup holder expanders are study and durable to use. The 4 little rubber tabs help smaller cups fit in and stops the larger ones from rattling and spilling. -Fit for diameter 2.5’’-3.75’’ car center console cup holder -Suitable for bottles/cups/mugs in 3.4’’-4’’ diameter Compatible with Hydro-Flask: 32 oz. and 40 oz. Compatible with Klean Kanteen: 40 oz. Compatible with Camelbak: 32 oz. and 40 oz. Compatible with Takeya: 32 oz and 40 oz. Compatible with Healthy Human: 32 oz and 40 oz. Compatible with Yeti Rambler: 20 oz., 26 oz., 30 oz., and 36 oz. Compatible with Yeti Mug:10 oz., 14oz. Compatible with Nalgene: 30 oz., 32 oz., 38 oz., and 48 oz.