These are Sullivans Gold-N-Clevises.
High strength Brass Plated Heat Treated Steel. Secure Retaining clips- prevents accidental openings. Clevis can be soldered. Interlocking collar with 2-56 threads. Clevis pin is welded into place for strength.
These steel clevises are used to connect a 2-56 pushrod to a control such as a control horn or throttle lever.