Special aviation aluminum alloy, high strength, impact resistance, twist and pressure. Surface treatment:high-mesh sand blasting machine and color quality pure matte. Ultra-low chemical residues, attached to a solid! Font Handling:Font clear mission, silk screening of non-mimeo, attached to a solid! material:metal Using Step Up And Rings To Take Better Pictures What is a step up ring Step up rings, also known as adaptor rings, allow you to use filters and accessories that are not the same size as your cameras lens. Lenses and filters come in a large range of types and sizes and unfortunately they don't always fit together correctly. Fortunately there is a step up or filter for any need. How step up rings work Step up rings provide a way to fit a larger diameter filter or accessory onto a smaller lens. up rings screws onto your lenses threading and provided a larger thread with with you can then attach other elements included more step up rings. How rings work rings work in the exact same way but instead provide a way to attach smaller accessories and filters to larger lenses. size:49mm/1.93 inch, 52mm/2.05 inch ,55mm/2.17 inch ,58mm/2.28 inch, 62mm/2.44 inch , 67mm/ 2.64 inch 72mm/ 2.83 inch ,77mm/3.03 inch colour:as shown Package Included:1 x 49mm-52mm Step-up ring 1 x 52mm-55mm Step-up ring 1 x 55mm-58mm Step-up ring 1 x 58MM-62mm Step-up ring 1 x 62mm-67mm Step-up ring 1 x 67mm-72mm Step-up ring 1 x 72mm-77mm Step-up ring Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.