R44319 Inner Swivel Ring Fits Case/International Harvester 850B 850C 850D 850EOne New Aftermarket Replacement Inner Swivel Ring Fits Case International Harvester Crawler Dozers This aftermarket replacement inner blade swivel ring (also called the blade center swivel ring) is part of the dozer blade mounting assembly on Fits Case 850 series crawler dozers. It works in conjunction with the outer swivel ring to allow the blade to pivot and angle during grading and dozing operations. One ring required per machine. Compatible Models