Precast Concrete Magnet, also known as Shuttering Magnet, is very widely used in modern precast concrete engineering. Precast concrete industry is a pattern used in quickly home constructions which is low cost and effeciently. Precast concrete magnet consists of steel outer casing, hex nut and magnet with push down-up button, it is treated with heavy-duty spraying and is firm and corrosion-resistant. The steel casing will downward concentrate magnetic loops to bottom side hence the magnetic force is very strong.