They clamp right onto your crossbars and hook onto your rack’s raised side rails. And the name reminds you of that cool song from the '70s.

• Broader range of fit - from small to big rails
• Grabs hold of the crossbar with an iron grip
• Lower profile provides sleek, integrated look
• Install towers in seconds with a simple lever turn - no tools needed
• Custom molded rubber pads on tower body and claw for protection
• Lockable with SKS cores - sold separately
• Patented technology. So don't expect to see this stuff on another website.