This genuine OEM sourced part is specially designed for use with Skil and Bosch saws. The purpose of a brush is to conduct the current in an electric motor. Unfortunately, over time it will wear out and it may begin to fail eventually requiring a replacement to maintain peak performance. Please make sure to refer to the owners manual and the appropriate diagram of your model for the correct location and application of this component. Keep in mind this high-quality set includes two durable brushes with attached lead wires and springs.