483, MIL Type 3-Conductor 1/4 in. phone plug. Screw Terminals, Red Handle, , Old PJ-309 or JJ-083. Finger diameter .206 inches. M642/2-1. Note: As of Jan 2014 the Switchcraft 483 will no longer be available. See the new Switchcraft 483Z which is the same plug but is not mil marked or mil qualified to M642/2-1.