2 x Step Up Adapter Ring: 1*a + 1*b Product Name : Step Up Adapter Ring;Material : Metal Male Thread : 49mm/1.9 inch;72mm/2.83 inch, Female Thread : 77mm/3.03 inch Size(Approx) : 80 x 5mm/3.1 inchx 0.2 inch(Max.D*H);79 x 7mm/3.11 inchx 0.28 inch(Max.D*H);Color : Black Weight : 18g. Adapter ring is suitable for filters, close-up lenses and other attachments to lenses with different filter thread sizes. The Bower 49-77mm Step-Up Adapter Ring easily screws onto the front of any 49mm Lens, and allows you to convert to the 77mm threads of accessory items (such as filters, hoods, flashes and lens converters). The Bower 72mm-77mm Step-Up Adapter Ring easily screws onto the front of any 72mm Lens, and allows you to convert to the 77mm threads of accessory items (such as filters, hoods, flashes and lens converters). Package Content : 2 x Step Up Adapter Ring Only the above package content, other products are not included. Note: Light shooting 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.