This adapter allows using Arri-B (bayonet) lenses on cameras with Arri PL mount.
This is most simple version with 3 set screws. Bayonet lugs position isn't limited, so you can secure a lens at any angle for convenience.
Flat metal tension spring protects a lens mount against damages from set screws.
Lenses with Arri-S (Standard) mount can be used as well, but their operation will change since this adapter locks the lens mount so it can't rotate inside as purposed by Arri-S original mount. Zoom lenses with Arri-S mount can be used without issues.
The adapter is machinedof high quality aluminium alloy.