1.Professional factory 2.Material:Steel, Pvc, Rubber, Al, SS 3.Various roller conveyors 4.Good quality ... ,57mm,60mm,76mm3.roller material:carbon steel,SUS304,SUS201,Al,PVC and PU coat. Welcome to visit our factory. free roller ... , gravity roller conveyor, no motor roller conveyor, free rolling conveyor,hand push roller conveyor