Dearmond pickup screw-on cable connector. These fit old '50s-'70s Dearmond jazz guitar, round hole guitar and other type DeArmond instrument pickups exactly. This connector is also used on old test equipment by Eico etc. Manufactured by Switchcraft USA. Similar in design to the screw-on connectors found on old ASTATIC JT-30 and other old type microphones but smaller in size; 3/8-32 UNEF-2B thread. Has spring and slotted-head set-screw for strain relief of cord, nickel plated brass housing and coupling ring. Only two solder connections required to install these on the end of a conventional thin (up to .187" diameter...) guitar cord; solder the 'positive' center wire to the hot center connection, solder the braided shield of the cord to the nickel plated steel spring, fasten down the set screw and you're good to go.