Baotong Door is a professional developing, manufacturing and installing enterprise of hangar door sand big industrical doors. The production range covered the door products include hangar door, lifting overhead door, garage door, etc and the logistic docking devices and the safety road blocks, etc. The door products, depends on the constructure and the opening method, include sliding doors, guillotine doors, lifting overhead doors, fabric lifting doors, round-the-corner doors, vertical bi-folding doors, folding doors, side hinged doors, etc.