... in order to saving space, ex double layer, double line, flexible. The structure is simple, with high reliability, and the maintenance ... end. Surface treatment:stainless steel, zincification(chroming), wrap plastic etc. Roller Sort:Metal (plastic) end cover, taper, accumulate, right angle knuckle ... ROLLERS CAN MADE BY COUSTOM REQUIREMENT! China Shenzhen conveyor rollers/pipes for transporting cargoes