Replace it every 60 hours, otherwise the electric rotating tool will overheat. Carbon brush, suitable for 4000 90930-04 2615298790 595 395 300 6000 300 215 217 100. installation : Step 1: Use a wrench to open the carbon brush cover. : Take out the carbon brush. Step 3: Replace the carbon brush with a new one. Step 4: Use a wrench to lock the lid firmly. Note: These brushes should be replaced every 60 hours. Colour:Photo Color Material:carbon + metal Package Contents: 6 * Carbon Brushes Computer display is different, there may be color difference 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.
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