This Japanese Industrial Standard specifies the steel sheet and strip (hereafter referred to as "sheet and coil"）and corrugated sheet manufactured by processing steel sheet into the shape and dimensions specified in JIS G 3316，which are coated so as to be equal thickness on both surfaces by a hot-dip zinc-aluminium-magnesium alloy coating process. The zinc-aluminium-magnesium alloy composition by mass fraction is normally 5.0 % to 13.0 % aluminium, 2.0 % to 4.0 % magnesium, 1.0 % other elements and the balance zinc.