This is the Du-Bro 816 2-56 Safety Lock Kwik Link (12/Pkg)

The Safety Lock Kwik-Link offers everything a modeler could want in a clevis and more. Simply put, it s ingenious, a grand slam!
Features

• Self tapping, no slop threads.
• Square shank for easy installation & adjustment.
• Steel plated stepped steel pin - no binding on control horns or servo arms.
• Steel plated safety lock slides into groove on pin for a secure and solid lock.
• Safety Lock is mounted in a track system on clevis.
• 2-56
• Ideal for upgrading or replacement on A.R.F. s.
• Super strong, super tough. More strength than you'll ever need.
• 10% lighter than steel clevis .
• Size stamped on safety lock for positive identification.
• Weight: 1 gram/Safety Lock Kwik Link
• Made in USA