Makita 9565PCV SJS High Power Paddle Switch Angle Grinder, 5" Powerful 13.0 AMP motor delivers more output and variable (2,800 - 10,500) RPM for the most demanding applications SJS technology is a mechanical clutch system that minimizes motor and gear damage Variable speed control dial enables user to match the speed to the application Electronic controller provides constant speed control which automatically applies additional power to the motor to maintain speed under load Electronic controller provides soft-start which is designed to suppress start-up reaction for smooth start-ups and longer gear life