1 GCS retractable conveyor chain 2 Roller of dia 50 or 60, one meter one roller 3 Roller could ... GCS Retractable Roller Conveyor Chain with roller dia 50 or 60Roller DiaRoller SpecRemarks 25, 38, 50, 57, 60, 63.5, 76, ... often used in light-duty industries for material handling.2. PVC/Nylon roller could be in different color like ... .Thanks! GCS Retractable Roller Conveyor Chain with roller dia 50 or 60