It conducts electricity when rubbing metal, making the engine easier to start. Transfer external current to the operating input current through the carbon brush. Starter Brush Holder and Brushes for Replace 31208-902, Brushes... 1. In the commutator motor, it can change the current direction.2. Transfer external current to the operating input current through the carbon brush.3. It conducts electricity when rubbing metal, making the engine easier to start.4. Professionally manufactured with pretty precision and reliability.5. Easy to install, high quality aluminium alloy, long time in use, match with the original car. Excellent Function: Transferring the external current to the working input current through the carbon brush. STARTER BRUSHES BRUSH HOLDER For 4.8L 5.2L SUZU TRUCK NPR NQR | eBay Starter Brushes,2000 Civic Starter Brushes,99 Civic Brush Kit Starter Replacing OEM numbers for reference is 31208-PCA-902. It conducts electricity when rubbing metal, making the engine easier to start. Detailed Product Description Sander ; High Speed ; 3, 4-1/2 And 5-1/2 Inch ; 16,000 Free Speed RPM Design: In the commutator motor, it can change the current direction.