Perfect solution to all high tracks, low tracks, narrow rails, wide rails and drip rails. Aerodynamic heavy duty T6 aluminum channeled crossbars. Black structural plastic molded in Triax 1180 and UV stabilized. Black valspar 1006-B1 OEM approved powder coated crossbars match vehicle trims. All metal parts are corrosion treated. Maximum versatility and durability. Theft deterrent locking knobs with keys for added security.