This steel-made   Magnetic Step-Up Ring allows you to magnetically attach Kase Wolverine magnetic filters to compatible lenses. The step-up ring screws onto lenses that have a   front filter thread, and your 77mm Wolverine filter then magnetically attaches onto the ring and is just as easily removed.

Function: through the adapter ring Apply the 77mm kase magnetic filter to the small-diameter 72mm or 67mm lens