... quality with competive price 5,ISO 9001 certificate 1,door retainer 708210MZ2,mild steel3,zinc plated4,good quality with competive ... system, side door lock inside system, door hinge system, door retainer, PVC profile, rear corner of body, roll up door, ... All the products can be used onto semi-trailer, refrigerator car, trailer truck, container car, machineshop stuck, tipper and so on. door retainer