Cup Holder Expander Insert/ Cup Holder Extender Insert. Enlarge the size of your cup holder. KAZeKUP Insert fits in most cup holders and improves their funtion. Catch basin holds spills and drips. Improves your Cup Holders In Seconds Fits In Almost Any Cup Holder in your Auto, Boat, RV and More as small as 2 3/4" Holds Almost Any Size Drink Even the Supersized with a base up to 3 5/8" Catched Spills and Drips keeping your Auto Clean Dishwasher Safe and Portable makes Cleanups a Snap