This is an EZ Connector set by Dubro.
EZ Connectors link a pushrod to a servo arm allowing it to pivot for
less bind in control surfaces.

Features

Works on 2-56 and smaller wire (.078")
Permanent or snap on mounting push nuts both included.

Includes

Two brass EZ Connectors
Two plastic snap nuts.
Two metal snap nuts.
Two 2.5x3.5mm slotted head screws.

Requires

Assembly onto linkages

Specifications

Length of brass connector: 10mm (.395")
Diameter of brass connector: 5.5mm (.217")