According to a certain space between the retention bracket mounted several roller conveyor the conveyor into items. Fixation generally consists of a number of straight or curved segments spelled as needed. Roller conveyors can be used alone or with other conveyor or working on an assembly line machinery used, has a simple structure, reliable operation, easy installation and removal, easy to maintain, flexible wiring, and so on. This conveyor roller with drive unit can be divided into two classes of unpowered and powered.