... roller.3.Our Powered Live High-speed Precision Conveyor Rollers, provide extended life, low noise and decreased wear on ... heavy goods.6.Installation method: spring shaft, screw shaft, flat shaft, two-pin shaft.7.Surface treatment: stainless steel, ... chromeplate, galvanized, plastic, or others.8. Important parameter of rollers: diameter of shaft, length, thichness ,diameter of roller, installation, ...