Ortlieb Upper Rail Fixing Screw Set Description: Replacement metric screws and plastic screws for affixing upper rails found in QL2.1 systems on Ortlieb pannier bags. Features: Original replacement hardware for select Ortlieb Pannier Bags Replacement screw set for upper rails of QL2.1 system Specifications: Color: Black Material: Plastic, Steel Not sure which QL (Quick-Lock) mounting system your panniers use? Check out Ortlieb's support page.