HQRP H12 Circular Filter Set fits Bissell 6583, 6584, 6585 series PowerForce Bagless Vacuum Coaster HQRP&reg; Filter plus HQRP&reg; Coaster; This PP compound filter is H12 filtration class and retains 99.97% of particles down to 0.3 micron. Dimensions: up diameter: 3.73"; down diameter: 3.37"; height: 2.62" 100% Compatible with Original filter; 2 weeks DOA replacement warranty!