This equipment is used for lifting steel plate and steel product. This product is designed to use the power of permanent magnet and electro magnet together to lift and release the steel plate. The permanent magnet is used to lift steel plate and the electro magnet will help reverse polarize power and release the steel plate. It is very reliable, safe and very popular in steel factory now. When no electricity all of the sudden, the steel plate will not drop, it will remain lifting, so no control panel with battery backup needed.