UDJ1018 Features: * Replacement filter * Use for vacuum cleaners * Fits lift-off revolution 3760, 4220, 6850, and6860 series, lift-off 3750, 6595 and 6801 series, power trak cyclonic 6390 series, momentum 3910 series, velocity 3950 series and total floors velocity 3990 and 6393 series Dimensions: * Dimensions: 4"" H x 6"" W x 6"" D