Dremel Carbon Motor Brush, 2-Pack, Dim Gray is a high-quality replacement part that fits Dremel 100, 200, 275, 285, 300, Master Mechanic Models: MM3750, MM375 & MM3950 Type 3, 4 & 5, and Moto-Tools #'s 275, 285, 395, 410 & 595, Type 3, 4, 5 & 6. Made of durable metal, this motor brush measures 1-1/2" in length and comes as a pair. It is essential for maintaining the proper functioning of your Dremel rotary tool.