The SeaSucker Monkey Bars utilize 6" vacuum mounts to secure to any roof. With quick installation, they are an extremely versatile and easy way to attach accessories to your roof. Perfect for bikes, surf boards, skis, kayaks, paddle boards, or cargo, the Monkey Bars can be mounted on almost any width car roof by simply adjusting the mount positions. With 4 vacuum mounts in the front and 2 in the back, everything stays secure. The 48" long black powder coated aluminum cross bars unscrew in the middle making storage and transport a breeze. Specifications: Bar Length: 48" Bar Diameter: 1.3" (33mm) Vacuum Mounts: 6 Total (4 Front, 2 Back) Mount Diameter: 6" Color: Black