The Main Brush Roll (191P20-2) is for use with the Makita 18V X2 LXT® Brushless Cordless Smart Robotic HEPA Filter Vacuum (DRC300, sold separately). The Smart Robotic Vacuum uses the Main Brush Roll to sweep debris into the dust box. This replacement Main Brush Roll installs quickly and easily for added user convenience. Constructed of durable, high-quality materials for long product life.