Magnetic Chamfer strips are used to create chamfers during the precast concrete process. When using side forms without chamfers, if chamfers are required, chamfer magnetic strips can be used flexibly. The chamfering strip has high strength, does not slip, and is not easily deformed. It is embedded with strong magnets such as ammonium iron boron and can be accurately positioned at any position of the bottom mold or side mold. The chamfering strip can be reused, saving costs, and is extremely effective in actual production and use. Great convenience.