Pro-Comp CompensationSimple runout compensation & Quick setup Reverse RotationEasily service vehicles with excess driveline drag QuickComp AdaptorFast runout compensation & Easy two-way adjustment Powerful Motor and Drive1.5-hp motor provides unmatched speed and torquePivoting Control ModuleOperates upright on either side of the vehicle & Easily accessible adjustments Anti-Chatter TechnologyOscillates machining speed to prevent buildup of vibration, Provides smoother surface finish & Eliminates use of chatter bands Variable-Speed Drive SystemChange speeds during machining, Resurface rotors at fastest possible speed & Service rotors on rear locking differentials without disconnecting the driveline