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You can now take your favorite mugs with you on the road! This is the best expandable cup holder design on the market! The top portion includes a silicon gasket with four rubber tabs to securely hold 3.5”- 4.0” coffee mugs. The bottom, extendable portion has three legs that expand and retract from 2.5”-3.75”. These legs are coated with a friction resistant silicon rubber to ensure that the adapter will not slip from the vehicle's cup holder. The Essentially Engineered vehicle cup holder expander is specifically designed for a broad range of fitment. This adapter fits perfectly in most vehicles, RV’s, boats, golf carts, couches, etc. However, due to the large variety of vehicle cup holders, in certain applications this expander will not fit. We ask that you please view the dimension photo and compare it to your specific application. Cup holders that are located in vehicle doors, have anything directly above them, are located on a steep angle, or have covers may not work with this design. We offer 100%, full product refunds due to the large variety of fitment. Installation is as easy as it gets; simply hold the base and twist the top clockwise to expand the legs. Once the legs are expanded enough to touch the cup holder walls, insert the adapter into the cup holder. Then, twist the top another ¼ turn to ensure a snug fit (be careful not to over tighten). Once installed, sharp corners will not spill your drink anymore. To remove, twist the top counterclockwise. This adaptor will fit the specific mugs listed below, and many more: YETI Rambler – 14oz and 10oz (coffee mug with handle) YETI Lowball 10oz Hydro Flask – 12oz Coffee Mug CamelBak – 12oz Camp Mug RTIC – 12oz Coffee Mug And a variety of other standard coffee mugs! For taller water bottles and coffee mugs, please see our original cup holder expander that fits taller, 3.4”-3.8” bottles.