ingdao Jolong Metal Product Co., Ltd was established in 1992. It is a professional enterprise obtained National metal windows and doors First Class Qualification that producing energy saving aluminum and upvc windows & doors with the integration of design,manufacturing,installation and service. Our high construction benchmarks, production efficiency and quality control have earned us ISO9001:2000 certification in 2004 and China Energy-saving Product Certificate in 2007. Jolong owns internatio

主要产品/业务: aluminum window and door ,upvc window and door ,upvc profile