Fangrui Product Details 52mm-55mm Lens Stepping Ring(black) 1)this Is A High Quality 52mm-55mm Step Up Filters Ring Steping Adapter 2)the 52mm-55mm Step Up Filters Ring Steping Adapter Is Made With Light Weight And Durable Aluminum Material 3)you May Also Combine Multiple Step Rings To Fit Even Larger Filters 4)this 52mm-55mm Step Up Filters Ring Steping Adapter Is Really A Very Useful And Helpful Gear For You To Save Money To Buy Extra Filter Lenses 5)with This Adapter Ring, You Can Experiment By Taking Close Pictures Of Various Small Items Such As Stamps, Coins And Insects Etc. 6)not All Lenses Are Designed With Standard Filter Accessory Screw In Thread Sizes. For These Lenses, Many Of Which Are Very Popular, The Way To Mount A Filter Is Via An Adapter Ring. A Main Of Adapter Rings Is That You Can Utilize One Size Filter With A Number Of Different Sized Lenses Via Different Adapter Rings 7)an Adapter Ring Consists Of Two Parts: An Adapter Ring And A Retaining Ring. The Non-threaded Filter Is Held In Place Between The Two As You Screw The Retaining Ring Into The Adapter Ring. The Adapter Ring Is Than Screwed Directly Into The Lens Or Is Mounted To The Outside Diameter Of The Lens Barrel Via A Setscrew Lock Ring Adapter