Omegon 55mm prism rail with screw

Manufacturer's product description:

Omegon 55mm prism rail for the Omegon polar wedge

This sturdy prism rail allows you to attach optical instruments, such as a mini mount, super quickly and easily to the Omegon polar wedge. You can also use this rail with other mounts. The custom-fit Vixen style design makes it very versatile.

The highlights at a glance:

• Hard-wearing and durable aluminium changing plate
• ¼" photo thread screw with a length of 9mm (requires a 3/16" Hex key)
• 55mm length
• Saves time when changing instruments
• Support surface: 55x24x13mm

Our expert comment:

Many telescope manufacturers (including Meade, Celestron) have been supplying their telescopes with imperial threaded screws for decades. For this reason, amateur astronomers should have a set of imperial Hex keys in their kit. You can get a set here