A2 stainless steel A2 grade steels are the most widely used stainless steels. They are used for kitchen equipment, chemical industry appliances, fasteners and much more. Also known as 304 grade stainless steel, A2 stainless steel contains around 18% chromium and 8% nickel, giving it high corrosion resistance and good heat resistance. Roll-over hinge A Reverse Hinge is a special hinge that allows a door or shutter to pivot in both directions, rather than just one direction like a conventional hinge. It is often used in applications where a door needs to be able to open and close from both sides, such as saloon doors in bars or kitchen doors in restaurants. Below is the table of technical dimensions: A x B to©thickness 50 x 38 2