The 9565PC is powered by a 13 AMP motor that delivers 11,500 RPM, with soft start for smooth start-ups. Labyrinth construction protects the motor with a complex set of channels, prohibiting dust and contamination. In addition, the protective zig-zag varnish seals the motor and bearings from dust and debris by creating a barrier under rotation. The 9565PC is engineered with SJS™, an innovation from Makita that protects the gears by automatically disengaging the motor should the grinding wheel accidentally catch or bind.