Pace uses their RES (Rail Expansion System) as standard equipment on the UltraGroove. It can fit any Pace Edwards Rack, Thule or Yakima set. Perfect for those looking to haul bicycles, surfboards, cargo baskets and more. The tonneau cover remains fully us The UltraGroove has a locking system that engages the latch system every 12 inches. This is great for partial bed use or carrying taller cargo. The strength and durability of this cover comes from the aluminum construction with an ArmorTek overlay. ArmorTek is a padded polymer that is bonded to the aluminum cover to form a weather resistant layer of protection, while adding a high quality finish. The handy pull strap allows the user to close the tonneau cover from the rear of the truck. The Continuous Tension Spring pulls the cover into the canister for an easy, smooth and reliable retracting action. End caps with seals extend over the tailgate to help cover the rear corners of the bed. The cover itself has a tailgate seal that rests above tailgate for the best seal possible. Another set of drain tubes are provided to cover both the front and rear of the bed. Some models may require drilling to install the drain tubes. The UltraGroove has turn-knob clamps that can be tightened by hand, eliminating the need for a wrench or drill for most vehicles. The mounting rails locks into the canister and tightens down with screws. No drilling required on most applications.