Starlock 3-D tool-accessory interface – delivers best-in-class blade grip providing more torque transfer Multi-tool versatility – accomplish flush-cutting, plunge-cutting, sanding, grinding, and many other tasks Extreme power driven by a 5.5 amp motor with reinforced metal gearing - 3.6-degree oscillating arc for better accessory utilization and increased productivity Constant Response circuitry maintains the desired speed under load - Variable-speed dial rotates from 8,000 to 20,000 strokes per minute to match speed to application for outstanding results