Used when you do not have a backrest or luggage rack. Mounts under the passenger seat. You can then use the metal D-rings for securely strapping your slip-free luggage to the passenger seat. - 4 heavy duty self-fastening straps - 4 metal D-rings for attaching straps and hooks - Fully adjustable to fit most under seat configurations - Protective material to help prevent scratching or movement. Note: Do not use with Route 1 Rover Pet Carrier. Fitment: Universal