All Mechanical and industrial products can come with different material structures ( Stainless steel, Carbon steel ,Alloys and Plastic made .)

Coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. In a more general context, a coupling can also be a mechanical device that serves to connect the ends of adjacent parts or objects