1) We are professional factory; 2) Production line imported from Europe; 3) CE and ISO. The specifications of wall angle can be matched with various ceilings.(ceiling grid manufacturers,double wall angle,channel)Size: 20*20*20*20, 0.4mm/0.5mmMaterial: Pre-painted, hot-dipped and galvanized steel.More other Specifications as below: Wall Angle(ceiling grid manufacturers,double angle,channel)