Walky Barrier by Walky Dog. Pet Safety Auto Barrier. Walky Barrier is a car pet safety barrier which, thanks to an innovative system, attaches to adjustable car headrests stems. No more holes which may damage your car. If not needed it can be easily folded behind the car seat. Adapts to virtually every car or small to midsize SUV. The Walky Barrier K9 Guard is one the most adjustable pet barriers available. Innovative "twist lock" design to lengthen or shorten the horizontal bars. Instructions; Raise headrests to max height > attach mount to headrest stems. Adjust & tighten height hardware (can be removed completely for small autos). Install horizontal bars into clips & twist to adjust & lock width to fit vehicle contour. No more loose hardware to be lost. We guarantee our item,so please contact the seller for any questions or usage. ** Car or mid size SUV must have round adjustable headrest stems for attachment.** ** If you have any questions or need assistance,please contact seller directly thru Amazon & we will give you personal service.**