The Under Seat Attachment comes in handy when you do not have a backrest or luggage rack to strap luggage onto.; 4 heavy-duty, self-fastening webbing straps 4 metal D-rings for attaching straps and hooks Fully adjustable to fit under most seat configurations Protective material to help prevent scratching or movement Lifetime manufacturer warranty; ; Note: Not to be used with Nelson-Rigg Route 1 Rover Pet Carrier