Tele Vue Optics NP127is Bottom Plate:

Versatile Mounting for Telescopes

Developed for Gibraltar 5 Mount: Originally created for use with the 5" Mount Ring Set, enhancing its versatility.
Universal Compatibility: Suitable for attaching any Tele Vue telescope equipped with a Tele Vue Ring Mount, Tube Rings, or Dovetail.
Wide Range of Mounts: Can be used with a variety of mounts or mounting adapter plates, offering flexibility in setup.
Astro-Imaging Support: Ideal for astronomers and astrophotographers seeking a reliable and adaptable mounting solution for their Tele Vue telescopes.