1. Carbon motor brushes are important components of the tool. Replacing the brushes can potentially repair motors with intermittent operation and restore the motor's electric braking function. These carbon brushes are retractable. 2. These are replacement carbon brushes suitable for BF501, BF502, and BF822 electric vacuum motors. 3. During installation, it is advisable to ensure that the carbon brushes are fully inserted and kept straight. It might be necessary to manually hold the brushes before re - securing the connector, which is normal. 4. Product information: - Name: Carbon motor brushes - Color: Silver - Material: Activated carbon - Size: 1×0.6×2.9 cm 5. Package contents: 6 carbon brushes. 6. The package includes only the above - mentioned contents and no other products. 7. Precautions: Due to light reflection and display differences, the color of the items in the picture may differ slightly from the actual product. The allowable error for size measurement is ±1 - 3 cm.