New rotating rear-end rail engineered for easier fit and tighter, better looks. New ?SpringLock?? bows are easy to install and they?ll never fall off? at any speed! NO drilling, NO damage! Fast install. No tools needed. The TuffTonno gives you a clean, smooth side with it?s ?peel & seal? strip edging and rear rail system. New improved J45 strip is the world?s strongest tarp attachment. Extang continues its? race heritage with this highly improved TuffTonno. The original TuffTonno set a world speed record at Indy and is now at the Indy Hall of Fame. Race pros choose Extang. The Best Warranty: Lifetime Frame and 10 Year Tarp!