HINGE SYSTEM Pivot Hinge Controlled door movement Thanks to Damper Control, System M has adjustable closing damping and hydraulic opening damping to guarantee a smooth door movement. Self closing and hold open positions System M is self-closing and has hold-open positions at every 90�° angle. This way you determine the spatial effect of the door. METAL BODY Galvanized Sheet Galvanized sheet is coated with "Zinc" in order to prevent corrosion of the metal. Galvanized is a type of sheet metal that is installed on all wet and damp floors and has no alternative. Because the galvanization in its structure is a sheet metal system that can cope with all the negativities and eliminates the pressure created by these negativities on the surface of the sheet. What is the raw material of galvanization? Galvanizing is the coating of steel immersed in molten zinc at 450-455 degrees. Zinc forms a triple phase layer by making strong bonds with iron.