This is a 67mm adapter ring, for use with the Nikon AF-4 filter holder.
Urth 67mm Magnetic Adapter Ring
Canon 67mm FA-DC67A Filter Adapter
Nikon Z fc Mirrorless Camera with FTZ II Mount Adapter
Nikon Z5 II Mirrorless Camera Body with FTZ II Mount Adapter
Nikon Z9 Mirrorless Camera with FTZ II Mount Adapter
Nikon Z7 II Mirrorless Camera with Z 24-70mm f/4 S Lens with FTZ II mount adapter
