We are research and development people, i have made a grill antimagnet which is widely used for separating tramp iron or ferrous contaminants from free flowing granular materials. Designed to remove unwanted iron contaminants, the antimagnet is provided with magnetic grills that are aligned in different angles so that a needle deflect at all the sides. Our grill antimagnet is made of rare earth magnets or ceramic magnets. The magnetic grills are aligned in certain angles that they deflect iron or ferrous particles. Needle deflection 3 inches. Regards.