Makita 9564CV Angle Grinder 4-1/2",12 AmpSuper Joint System (SJS) technology helps prevent gear damage caused by accidental wheel binding. Variable speed control dial enables user to match the speed to the application. Powerful 12. 0 AMP motor for increased output power in a more compact tool (5. 3 lbs.) Soft start feature for smooth start ups Labyrinth construction seals and protects the motor and bearings from dust and debris for longer tool life Electronic speed control maintains constant