... or 60, one meter one roller 3 Roller could be customized GCS Retractable Roller Conveyor Chain with roller dia 50 or 60Roller DiaRoller SpecRemarks ... 25, 38, 50, 57, 60, 63.5, 76, 89---- 1. carbon steel, stainless steel, pvc ... often used in light-duty industries for material handling.2. PVC/Nylon roller could be in different color like grey, white etc ...