1. The carbon brushes are made of high quality materials. 2. with auto stop function, once the carbon brushes are worn out indicating the need to replace the carbon brushes, the machine stop working; Part No. (part number): N421362; is a good replacement part. 3. copper wire conductivity is good, can repair motor intermittent faults, reduce ; please confirm the part number before purchasing. 4. Compatible with DWE4202 DWE4204 DWE4206 DWE4217 DWE4238 Angle Grinder. With automatic stop function, once the carbon brush wear indicates that the carbon brush needs to be replaced, the machine stop working.Worn brushes are often the cause of a poorly running motor. Replacing brushes can fix an intermittent motor. Colour:As Shown Material:Metal Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. The actual product may have slight color difference or difference, which not affect the use Package Contents: 4 x carbon brushes Only the above package content, other products are not included. Note: Light reflection 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.