The path of the magnetic flux inside a workpiece is represented by a semicircle that starts from the center of one pole of the magnet and closes at the center of the pole with the opposite magnetic polarity. In a thin workpiece, this flux is not fully closed, which creates a flux leakage. Therefore, the resulting holding force will be lower than that which can be achieved when the entire flux is absorbed by a workpiece with sufficient thickness to contain it.

The chemical composition of the load to be lifted can also influence the magnetic attraction force, depending on its magnetic permeability. Common steels (ST37-52) with low carbon content have good magnetic permeability. Alloyed steels with a higher content of non-ferrous components have low magnetic permeability. Heat treatments that modify the molecular structure of the steel can also reduce magnetic permeability. The more “alloyed” a steel is, the poorer its magnetic response will be, and the higher the likelihood of residual magnetism in the workpiece.

As the temperature increases, the molecules of the ferromagnetic material move faster; this phenomenon causes a reduction in the magnetic conductivity of the material itself. The operating temperature of the handles is up to max. 80°C.