Rib-Cage Connector System Amphenol FCI Rib-Cage high-density, .05' x .05' pitch connector system has multipoint receptacle contacts that provide optimal reliability in high-vibration and shock-prone applications. These devices from FCI feature surface-mount and through-hole attachment options, multiple stack heights, and a polarization option that prevents mismating. Amphenol FCI Rib-Cage Connector System is ideal for industrial and instrumentation applications.