... , 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 ... roller, pulley roller, pvc roller, sprocket roller, retractable roller, taper roller, drive roller, non-drive roller. All these roller used ...