Abstract: A cap mountable on top of a post connects to, holds and supports, a pair of wires. The cap guards sharp edges at the post top to prevent accidental contact with people or livestock. The cap is readily visible as a marker, a reflector or a color coded sign. A portion of the cap fits closely to the upper post while a crown portion projects thereabove and a bill portion projects outwardly therefrom. The crown and bill portions each define a cavity longitudinally aligned for holding a wire adjacent the post. A narrow throat having a least dimension slightly larger than the diameter of the wire to be held extends laterally from the cavity to a flared mouth that further extends and opens in an upwardly direction. A wire can be moved laterally from a position adjacent the flared mouth, through the narrow throat, to a position within the cavity and can be removed therefrom in a reverse manner.