The cover layer is heat galvanized steel plate with beautiful cast square grid and venation.
The door surface have rich colours and luster.
The inner material is polyurethane, and the door is 35-51 mm thick.
The rails are made of galvanized steel plates with two lifting ways:standard lifting and low net distance lifting.
Several types of machines for opening door for choice with manual,electric and remote operation functions.
Safe protection: the door has the function that it will rebound when the resistance is above 5kg, its response time is less than 2 seconds.