Dayco 89377 Belt Tensioner Manufactured with a specially coated patented flat wire spring to allow the internal tension to be concentric, thus providing a more even degree of constant tension Contains a metallic locator pin built to withstand extreme drive demands and properly locate the tensioner for installation The patented Deflected Arm Plate dampens arm movement, prolonging the life of the tensioner by limiting the amount of rotational movement This tensioner is another Dayco product proudly made in the USA Limited Three Year Warranty