Krasnogorsk-2 is 16mm camera, so image circle of it's lenses covers sensor of Black Magic Pocket Cinema Camera with minor vignetting.
You can install this adapter on APS-C cameras as well, but lenses will vignette quite much on such larger sensor.
This version has set screws. Detachable mount makes the adapter shimable if it is necessary to fine tune a flange focal distance (may be necessary for zoom lenses since they are very sensitive to back focal distance).
We have also bit more complex and expensive version with bayonet nut.