Petego Kar 9 Keeper Car Barrier for Pet Automotive Safety Universal car barrier for pets. Adjustable height from a minimum 9.75 (with removal of the TOP BAR) to a maximum 18.5 Adjustable width to a maximum 59.25 For use in front or rear of cars and SUVs NOTICE!!! This products DO NOT work on the VOLVO CARS models that do not have vertically adjustable HEAD RESTS, if the headrest in your car is FIXED as most VOLVO CARS and you cant see the CHROMED ADJUSTABLE STEMS in between the back of the seat and the head rest, this product WILL NOT WORK IN YOUR CAR. High resistance square steel tubing, Solid galvanized steel elbows , Reinforced double thickness round tube extensions, Solid, built-in adjustable clamps, Neutral grey color for reduced visual impact and Extremely compact packaging for shipping and storage The Headrest Stem Clearing Extension (K9HSCE) is available (sold separately) for automobiles where access to the headrest stems is limited (built-in safety belt housing or fixed middle headrest)