... , stainless steel, pvc, nylon2. zinc-plating, galvanizing, chromeorplated3. Use press bearing or precision bearing4. shaft could be spring-loaded or fixed ... of categories. Gravity roller, light-duty rollers, snub roller, end roller, pulley roller, pvc roller, sprocket roller, retractable roller, taper roller, drive roller, non-drive roller. All these roller used in bulk ...