The Dremel Carbon Motor Brush Set restores life to your corded rotary tool. These motor brushes are designed for Dremel master mechanic and rotary tool models. They can also be used with Dremel contour sanders. These brushes should be replaced every 60 hours. The right brush means proper performanceService part onlyFor use with Dremel rotary tool model(s): 100, 200, 275, 285, 300, 395 and 595 (type 3, 4, 5 and 6) and Dremel contour sander 6000 (type 1 and 2)