[Unique Infinitely Adjustable Base]: UP to 4" diameter. You could adjust different sizes to fit your various cup holders in car, truck, RV, SUV, tesla, boat, golf cart, etc. The most adaptable base with modern design knob, made with durable plastic. Just little twist, not like open bottle caps. This would make an awesome Father's Day gift! Your father will love it. [Unique Infinitely Adjustable Base]: UP to 4" diameter, after attached rubber extender. You could adjust different sizes to fit your various cup holders in car, truck, RV, SUV, tesla, boat, golf cart, etc. The most adaptable base with modern design knob, made with durable plastic. Just little twist, not like open bottle caps [Flexible Adjustable Gooseneck]: Up to 8-inch long neck. You will get the best angle, the best position through adjusting the flexible gooseneck. The phone mount part can be rotated 360-degree. You could easily adjust the view you want, not just only vertical mode [Drive Now Text Later]