... roller 3. drive roller/non-drive roller 4. in steel, pvc or stainless steel 5. in grey GCS Sprocket gravity roller, taper ... , 50, 57, 60, 63.5, 76, 89----1. carbon steel, stainless steel, pvc, nylon2. zinc-plating, galvanizing, chromeorplated3. Use press bearing or ... line, furniture factory...2. Gravity roller could be made from steel Q235, stainless steel, pvc, nylon, cold-drawn bar ect..3. Pvc roller ...