Brush Kit PN330 includes two motor saver brushes. Available in 120V and 240V. These graphite motor brushes conduct electricity to the motor commutator. Brushes are a wear part, with a life of about 650 operating hours. They rarely need replacing on a handheld unit, but if they do, we recommend installing a motor saver brush on at least one side. The motor saver brush contains a non-conductive element to shut down the motor when the brush is completely worn. This protects the commutator from being scratched by the motor lead wires.