Closed Rail Roof Bars

What do closed roof rails look like?

Look at the roof of your vehicle and you'll easily know if your car has rails, you'll notice two fixed bars that run parallel to each other. They start at the rear and run just above the doors towards the front of the vehicle. Closed rail bars are fully solid and don't have any gaps or holes in them. You may find that the top part of the rail is thicker than the bottom, almost as if there's a groove where roof bars can grip on to.