Features:
Allows Magnetic Mounting of 82mm Magnetic Filters

Function: 
Through the adapter ring Apply the 77mm magnetic filter to the small-diameter 52mm - 72mm lens 

The magnetic step-up adapter ring is screwed onto the filter thread of the compatible lens,
allowing you to magnetically connect the magnetic filter to it.
This magnetic step-up ring enables you to use magnetic filters on multiple lenses.
For example, purchase a 77-82mm magnetic step-up ring and 82mm magnetic filter,
which can be used with both 82mm lens and 77mm lens.