... 5.bear big capacity 1.There are different kinds of rollers:gravity roller and powered roller.2.The shape is ... High-speed Precision Conveyor Rollers, provide extended life, low noise and decreased wear on your conveyor system.4.The material of ... steel, chromeplate, galvanized, plastic, or others.8. Important parameter of rollers: diameter of shaft, length, thichness ,diameter of roller, installation, ...