... .The material of roller can be carbon steel with plastic or zinc coated, or stainless steel.5.It can bear heavy goods.6 ... , screw shaft, flat shaft, two-pin shaft.7.Surface treatment: stainless steel, chromeplate, galvanized, plastic, or others.8. Important parameter of rollers ... goods, goods weight, have motor do drive or not. Carbon/Stainless Steel Conveyor Rollers/Drums/Pipes