This Benro 82-72mm step down ring is designed for use with the Benro FH100 filter holder. In combination with a separately available 82mm adapter ring it will allow you to attach your filter holder to lenses with a 72mm diameter screw thread mount. The FH100 holder is sold separately.
The FH100 Filter Holder attaches to your lens with an adapter ring, available separately in sizes from 72mm to 95mm. This stepping ring is an alternative to purchasing a 72mm adapter ring, and instead allows you to 'step down' to use your 82mm adapter ring with lenses sized 72mm.
Please note that the item pictured is indicative only and this listing is for the 82-72mm step down ring.