The Lens Cuff is a unique system that doesn’t use a traditional baseplate with rods to mount lens motors. Instead, it clips on the lens.The advantage to this is you dont have to have a heavy baseplate with rods and lens support unless you need the support for a heavy lens. In that case you can use the tap on the bottom of The Lens Cuff to use lens support. The Lens Cuff uses a clamp that fits on most cinema lenses and includes three inserts/donuts to adapt to smaller sizes.
Source: The Lens Cuff– A new way to mount lens motors to a cinema lens – Newsshooter