Harmonic Balancer Installer/Puller Tool Fits All GM LS for Aftermarket Balancers ProformFor use with GM LS engine aftermarket Balancers. This heavy duty, professional tool, equipped with roller a thrust bearing, can also be used as a LS aftermarket balancer puller! The CNC machined components have a black oxide finish, and are stored in a padded storage case (included) to keep the kit together and organized. The threaded shaft easily threads into the crankshaft, and with the aid of the Roller Thrust Bearing, the drive nut rotates freely