Buy Large Alnico Power Magnets online with e-Magnets™ Large Power Magnets are powerful and durable horseshoe magnets manufactured from Alnico 5. They give a high performance through a range of airgaps and high temperatures. A high level of stability, corrosion resistance and temperature resistance. Ideal for retrieving parts from hot and corrosive liquids. Maximum operating temperature:500 deg.C Ideal for retrieving ferrous material from high temperature salt baths, plating vats or oil quenching.