These compact yet powerful permanent magnets lift can be used on flat or round surfacesand contain an internal release devise that does not contact or damage thesurface of the part being lifted. Permanent magnetic lifts eliminate the fearof dropping the load being lifted due to power failure. Lightweight: powerful Rare Earth design for easy handling Lifts flat or round loads over 1" thick Easy manual release does not contact load Nickel-plated pole shoes provide hardness and rust resistance producing area:China