1. sprocket gravity roller 2. taper roller 3. drive roller/non-drive roller 4. in steel, pvc or stainless steel 5. in grey ... GCS Sprocket gravity roller, taper roller, pvc rollerRoller Dia (mm)Roller SpecRemark25, 38, 50, 57, 60, 63 ... .5, 76, 89----1. carbon steel, stainless steel, pvc, nylon2. zinc-plating, galvanizing, chromeorplated3. Use press bearing or precision ...