The T2 thread allows a T2 mount to connect the bellows to modern cameras.
The small screw fits into a slot in the rear stage of the bellows to restrict the rotation.
The 10 mm dimension provides a built-in extension to the adapter so that the projecting grip, pentaprism, etc. of modern cameras can be accommodated.
The two components screw together, allowing the mount to rotate without coming off the rear stage of the bellows.

Weight is 33 g.

Machined from anodized aluminium.

More Information
Adapter Front Side	Dovetail 47mm
Adapter Rear Side	M42x0.75 (T2)
Adapter Added Length	10mm
Material	Aluminium
Manufacturer	RafCamera
Advantages	Design: Many of our products were inspired by customers, and have great application value. Material: Aluminium alloy 2024 (used in aviation and space industry). It is light and durable. Technology: Cutting from solid bars provides the highest possible product quality. Tolerances: A bit tight fit is better than too loose fit for imaging equipment.