1. Hidden hinges and high quality ironmongery (hardware)
2. Suitable packages in 3-layer cartoon
3. Painted with the best quality electrostatic power paint (Peka)
4. Conveyor painting line, pickling and phosphation treatments (automatically)
5. The frame and its door are at the same level. 
6. Laser cutting, CNC punching and CNC bending machines are used through the whole process.