Magnetic separators are arranged to repel the N and S poles of neodymium magnets embedded in a stainless steel housing. The affected area where magnetic substances can be attracted will differ depending on the thickness of the embedded magnets. If the embedded magnet is thin with a thin step, the magnetic force lines will be small and short. In comparison, the magnetic force lines will be long and extend far when the magnet is thick with a wide step. Generally, the affected area is larger when the magnetic force lines are longer.