The Makita 1515177 is a cloth dust bag which is a standard part for the BO5021, BO6030 and BO4900 sanders. Please note a separate nozzle assembly is also needed to connect the dust bag to the machine. Features and Benefits • Cloth bag for efficient collection • Better finish. Less dust • Suitable for Makita BO5021, BO6030 and BO4900 • Clips onto nozzle assembly (not included)