Carbon motor brushes are one of the most components for power tool. Replacing brushes can fix an intermittent motor. brushes can restore a motor's electric . The carbon brush is retractable. This is high quality replacement carbon brush for BF501 BF502 BF822 Electric Vacuum Motor Please remember when you are installing them to make sure the carbon brushes go in completely and stay straight. It is normal to need to hold them in until the connector is re-secured. Item: Motor Carbon Brush colour:Silver Material:Activated carbon size:1 x 0.6 x 2.9cm Package Contents: 2 x Carbon Brush Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.