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Crawler Crane Undercarriage Part Quality SCC500D Upper Rollers are suitable for SANY SCC500D crawler crane. It is 100% new quality with the durable character.SANY SCC500D Upper Rollers/SANY SCC500D Top Rollers/SANY SCC500D Carrier Rollers are used to hold the track shoe up, so that the crawler has a certain tension.