This is a Rod End set by Dubro.
These rods work well as tail bracing, flying wires, aileron connectors
on biplanes, strut bracing, and anywhere a solid wire connection
FEATURES: Solid steel construction
Steel threaded fork for easy adjustments.
Overall length adjustment by crimping wire where desired.
Full mounting hardware included.
INCLUDES: Two 12"x4-40 steel rods
Four fork rod ends
Four mounting straps
Four 4-40x1/4" screws
Four 4-40 nuts
SPECS: Rod length: 304mm (12")
Rod diameter: 2.2mm (.088")
Strap length: 40.7mm (1.602")
Strap width: 6.5mm (.259")
Strap thickness: 1.6mm (.065")
COMMENTS: One end of each steel wire includes a threaded fork shaped coupler.
The other end has a coupler that will slide up and down the wire,
following the instructions, if you crimp the end of the wire at
your desired position, you can cut off the excess, and adjust