NM type couplings are manufactured using special synthetic rubber and contain two similar bodies of cast iron. These extremely high quality Cast Iron Flanges is specifically designed not only to protect the flexible rubber but also for the transmission of power. The flexible rubber is made from rubber with steel cores being inserted in its teeth so that it enhances the durability and performance of the coupling, giving it an extended life. It is ideal for applications in pumps, fans, compressors, vehicles, transporting equipments, constructors, cement mixers, tractors, transmission machines, metal working machines, rollers, and can be use for all kinds of transmissions.