... Magnets,such as Square,Disc and Ring Holding Magnets,Hard Ferrite (Ceramic),Alnico,NdFeB and SmCo assemblies are specified for many ... and enigneering .These magnets are made by setting ferrite ,Alnico,NdFeB and SmCo magnet in steel parts (and/or some nonferrite magnetic ... ,gray ,Nickel or Zinc coating ,or rubber covered .A holding magnet has a particular magnetic circuit that can concentrate or insulate ...