A dedicated peening tool to ensure the safe & secure connection of Campagnolo 11 speed chains After pressing the special connecting rivet into a Campagnolo 11-speed Chain & breaking off the pilot Campagnolo requires the end of the connecting rivet to be peened or deformed to prevent chain failure The precision-machined CT-11 is used to accurately perform this critical process The CT-11 will not install or remove chain rivets its sole function is topeen & secure the end of the Campagnolo 11 speed connecting rivet The Park Tool CT-4.2 Master Chain Tool is used for rivet installation & removal