... roller, stainless gravity roller, weld pipe gravity rollerRoller Dia (mm)Roller SpecRemarks 25, 38, 50, 57, 60, 63.5, 76, 89---- 1. carbon steel, stainless steel ... non-drive gravity roller could be made of nylon, weld pipe, stainless steel. For nylon gravity roller, the color could ... be grey or white.5. Steel gravity roller is often ...