Qingdao Jolong metal Products Co., Ltd. Established in 1992, is an enterprise that designs, produces and installs doors and windows made of aluminum, PVC as well as the glass wall. It has passed not only ISO 9001: 2000 attestations in 2004, but national energysaving products attestation in 2007. It is also the member of Shandong constructional machine association. It is honored as "Renowned Products" "Top 100 enterprises" and "Top 50 in the doors and windows industry" by Shandong construction bureau, "Member Unit of High Quality and Honesty" by the association of Qingdao constructional machina association and association of constructional material in 2005. The products have also been awarded several honors such as "Trust-worthy products" and "Qingdao-renowned enterprises for keeping from fake productions" for several years.