25mm To Flat Adapter
This adapter has been designed to give you a flat surface where you can attach a 3M adhesive adapter plate (normally supplied with most actions cameras).
On the base there is a 25mm female, allowing you to mount to any of the Ultimateaddons 25mm male attachments / adapters. The size of this is approx 42 x 52mm.
This allows a wide range of action cameras to be mounted.