... with pulley 5. taper of dia53 or 63 GCS drive single/ double groove cone/ taper roller dia50 or dia60Roller DiaRoller SpecRemark ... carbon steel, stainless steel, pvc, nylon2. zinc-plating, galvanizing, chromeorplated3. Use press bearing or precision bearing4. shaft could be spring-loaded ... machine and logistic store etc.2. GCS groove roller has single groove or double groove. Used with pulley to drive. ...