Product Description – Automatically adjusts primary chain tension – Provides consistent and even tension for better shifting – Reduces shift noise; provides a smoother ride – Extends primary chain life THESE ARE THE PROVEN AND TRUSTED TOOLS WE HAVE BEEN SELLING FOR YEARS TO MECHANIC SHOP AND HOME MECHANICS. OURS INCLUDES TWO COMPLETE SEPARATE PULLERS COMPARED TO OUR COMPETITORS. So if you lose your puller, you can still use the installer and vice versa. Fits: 1999-2017 Twin Cam Engine Kit Includes: One Set of Inner Cam Bearing Installer and Puller Tools (As Pictured)