50 Round Belts RD for Eureka & Sanitaire Upright Vacuum 30563 52100 Commercial Sanitaire Models ut" style belt 600,1400,1900,2000,2100,4000,6400 and 5000 Series, except 5180,5184 and 5188 Fits all Eureka and Sanitaire commercial vacuums that use a "don Eureka models