The metal flexible connectors are made of metal coating zinc or brass coating nickel, used with metal flexible conduit, there are three type of this kind of connectors, straight connector,45 degree connector and 90 degree connectors. We use them to connector the conduit with metal box, and wiring, will make the connecting stronge and protect the inside cables from water, salt,oil and so on. And for diferent countries, they used different thread of it, Metric thread, PG thread,G thread and NPT thread, all of them we can produce.