The Thule Complete Evo Edge Clamp 720501 Car Roof Rack for Naked Roof-tops is Thule's newest design for vehicles with naked roof tops. The Thule Evo Edge Clamp roof rack provides a superior, dependable fit on vehicles with smooth, gutterless, naked rooftops (without attachments or railings). A simple click-in attachment point on the Evo Edge Clamp Foot allows you to insert and snap the fit kit clips into place in seconds. The Evo Edge Clamp Foot uses a front facing adjustment mechanism which makes firmly attaching and positioning the bars easy and secure. The Evo Edge Clamp Feet are safely secured to the vehicle using an ergonomic torque limiter key tool which clicks once the correct assembly tension is applied. The Thule 720501 Evo Edge Clamp roof rack is the easiest, fastest and safest rack design available. The rubber padded Evo Clamp Foot rests on the roof of your vehicle. Thule's Evo Fit Kit securely attaches the Evo Edge Clamp Foot Pack to the rooftop. Thule lock cores are recommended (sold separately).