Manvik manufactures ready-made door and window frames using high quality materials and processes. They use precision machines to cut locks, hinges, and channels from PPGI steel sheets coated with zinc. Plastic caps are added during assembly to provide accurate fittings. The frames are made from 1-1.5mm thick prepainted galvanized iron sheets to create sturdy and durable designs. Manvik offers centerlock, al-drop, and stripped hinges along with other features for customized door and window frames.