The shelf of a vehicle is a structure connecting the roof to the body of the car. Usually the studs are marked from the front of the vehicle to the rear, in alphabetical order and the jam door (B-pillar ) It is located between the driver and passenger door. It is usually composed of several key parts: internal and external panels that encased the reinforcement. Currently, the majority of automobile manufacturers include the shelf's outer gate as part of the side bodywork 40 outside; click on the menu to see more ). Manufacturing of parts of studs of gates from advanced high strength steels is increased due to the formability and the important role of this piece to comply with the requirements of side impact, dented side and roof crush.