These ultra-strong 20 lb. magnetic hooks are a versatile product that can be placed almost anywhere and hold up almost anything with ease. Unlike weaker magnetic hooks that slip and slide everywhere, these hooks are more than powerful enough to hold things still. If attached to a smooth, clean metal surface, these magnets can even be used in permanent applications with plenty of holding power to spare. If being attached to delicate surfaces that are easily scratched, then a thin sheet of cardboard, plastic, tape, or rubber can be placed in-between the magnet and the surface.