The Dayco Tensioner Retainer Pin Set is designed for installation and maintenance of timing belt hydraulic tensioners. Dayco recommends the use of this handy Tensioner Retainer Pin Set to safely retain the hydraulic piston of a timing belt tensioner in a compressed state during servicing. Consisting of 6 different sized spring hardened steel pins, the set accommodates a wide variety of timing belt tensioners...including certain serpentine belt applications. Product Features:Safely retains the hydraulic piston of a timing belt tensioner in a compressed state during servicingConsists of 6 different sized spring hardened steel pinsAccommodates a wide variety of timing belt tensioners...including certain serpentine belt applications