The Kase Wolverine converter kit contains two adapter rings that are designed to convert a traditional threaded filter to a magnetic connection.
The first adapter ring has rear threads and attaches directly to you lens, with a magnetic connection only on the front of the ring.
The second adapter ring has a magnetic connection on the rear side and is threaded on the front to allow you to screw the adapter ring to the rear of a threaded filter and convert the filter to a magnetic connection.