... ,brass polished case, all this can take with front flange, backflange and U-clamp.BEZEL MATERIAL:Steel ... ), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor bronze ,SS and so on. ... ,brass polished case, all this can take with front flange, backflange and U-clamp.BEZEL MATERIAL:Steel ... ), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor bronze ,SS and so on. ...