... , 50, 57, 60, 63.5, 76, 89---- 1. carbon steel, stainless steel, pvc, nylon2. zinc-plating, galvanizing, chromeorplated3. Use press bearing or ... gravity roller could be made of nylon, weld pipe, stainless steel. For nylon gravity roller, the color could be grey ... of categories. Gravity roller, light-duty rollers, snub roller, end roller, pulley roller, pvc roller, sprocket roller, retractable roller, ...