For 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 for smooth and even pressing/pulling (installing/removing) action on the balancer. The enlarged bearing plate provides a large contact area with pilot studs to keep the harmonic balancer perpendicular with the crankshaft's centerline for bind-free action.Proform Adapters/Shaft and Hardware Included 66518Specifications: Tool Type LS Tools Feature/Benefit Designed as a puller for aftermarket balancers since they have threaded holes. The installer functionality is universal for LS. Applications GM LS Series Engines Category Harm. Balancer Tools Make GM Description_ABR Damper Tool Description_SHO Harm. Balancer Tools Description_INV LS Harm. Balancer Installer/Puller Tool Description_DEF Harmonic Balancer Puller Description_ASC GM LS Harmonic Balancer Installer/Puller Tool Description_ASC Universal LS Balancer Installer Description_ASC Aftermarket LS Balancer Puller Description_LAB GM LS Harmonic Balancer Installer/Puller Tool Description_DES Harmonic Balancer Installer/Puller Tool Description_DES Aftermarket Balancers Description_DES Fits All GM LS Description_EXT LS Harmonic Balancer Installer/Puller Tool Description_EXT Fits GM LS Engines Description_EXT Heavy-Duty Model Equipped with Roller Thrust Bearings to Reduce Friction Description_EXT Can Be Used as Puller for Aftermarket Balancers Description_EXT Adapters/Shaft and Hardware Included Description_MKT For 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 for smooth and even pressing/pulling (installing/removing) action on the balancer. The enlarged bearing plate provides a large contact area with pilot studs to keep the harmonic balancer perpendicular with the crankshaft's centerline for bind-free action.