Purposes 1.Roller is used in indoor environment. 2.It is used in the roller conveyor and for transport storage of boxed unit load with flat bottom. Features 1.OD=25mm,38mm,50mm,60mm,78mm,89mmETC. 2.Tube stucture selectable:Coat rubber,Carbonsteel,Stainlesssteel,Aluminiumalloy ETC