Inno IN-SU roof rack system is designed for cars with smooth roofs without rain gutters. Telescopic knob for quick and easy installation. Keys & locks included. Requires the use of the appropriate SU Fit Hook set for a perfect fit. [set of 4]Nearly always an excellent alternative to their higher priced competitors, Inno Racks also includes locks with virtually all their products. Other manufacturers charge extra for security.Inno is the leader in the Japanese roof rack system market, now the Inno Racks Company is growing quickly in the American market. Inno car racks first appeared on the U.S. market in 2003. Not surprisingly, the racks have caught on quickly in the States and are considered an ideal match for the nation's growing legions of active "weekend warriors" and professional athletes who demand technological superiority.No other company tests its racks as thoroughly or as vigorously to make sure that they protect the cargo and the vehicle in what can often be harsh conditions. From Inno's testing labs with UV-ray and salt spray testing booths to the race track designed for automotive manufacturers that are used for real-world high speed testing, Inno takes the safety and your investment in your gear seriously. All Inno products are backed by an industry leading warranty.