... case,brass polished case, all this can take with front flange, backflange and U-clamp.BEZEL MATERIAL ... ring), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor bronze ,SS and so on. ... ), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor bronze ,SS and so on. ... accuracy, recalibrators,restrictors, special connections and more. Back Connection Steel Case Gauge 4Z2