... Roller of dia 50 or 60, one meter one roller 3 Roller could be customized GCS Retractable Roller Conveyor Chain with roller ... pvc, nylon2. zinc-plating, galvanizing, chromeorplated3. Use press bearing or precision bearing4. shaft could be spring-loaded or fixed ... chain, conveyor wheel, conveyor bearing, wheel chain, ball transfer unit, return bracket, press bearing, skate wheel, plastic pulley, ...