- The 3M™ mounting brackets mb and mbs series have been designed to mount 3M™ molded rubber Terminations. The MB series brackets are made from galvanized steel, while the mbs series brackets are made from stainless steel to provide corrosion protection in highly contaminated environments. These brackets are attached to the cable just below the termination. This provides a tongue that can then be attached to an MB-1 mounting bracket or to any other support.