Paws 'N' Claws - Dog Barrier for Vehicles - Pet Restraint Car Backseat Divider Vehicle Gate Cargo Area Car Truck SUV Trunk Mesh Net Barrier is made with scratch and tear resistent pet screen. Installation is quick and easy. Top of barrier attaches around headrest and the bottom of the barrier attaches around the seat frame. Half inch metal pipe is inserted on top of barrier preventing your dog from pulling the barrier down and climbing over. How to determine what size is right for your vehicle. Adjust vehicles headrests to their highest setting. Measure the width of the vehicles interior at the level of the top of the headrests. If it measures greater then 40 inches but less then 50 inches, the 40 inch model is right for you. If it measures greater then 50 inches the 50 inch barrier is right for you. The 40 inch barrier is ideal for smaller cars, trucks, and SUV's. The 50 inch model is ideal for full sized sedans, Large SUV's, and full sized Trucks.