This 'SteelHead' Yakima mount secures your bicycle on the car roof when locked. It carries the bike with its all metal Long-Throw Skewer. Fits a wide range of tires and rims. Has to be installed on round crossbars. The lockable SKSs core is brand new and still in plastic bag. It holds bike rock solid with aerodynamic metal fork block. Comes with instructions! Gently used - very good condition. Please see our ad for another bicycle mount for $55. They work well together.