2pcs/Pair Mini Carbon Brushes 6.3x4.8x8.4mm Repairing Part Carbon Brush For Rotary Tool For Dremel 4000 Grinder Replacement

Step 1: Use the wrench to open the cover of carbon brush.
Step 2: Take out the carbon brush.
Step 3:  Replace with the new carbon brush.
Step 4: Use the wrench to lock the cover well.

2 x Carbon Brushes