FCR/BCR Metal Shell Series: Zevulun Metal Shell Connectors are designed for heavy-duty use. The 1500 and 2000 Series Connectors are fully compatible with Subconn and are available in pin configurations from 2-8 contacts; flange (FCR) or hex (BCR) shells. The mating cable for the 1500 Series is the Mini-Connector (MC) cable, and the mating cable for the 2000 Series is the Standard Circular (SC)