2 x Step Up Adapter Ring: 1*a + 1*b Product Name : Step Down Adapter Ring;Lens Side : 52mm/ 2 inch Filter Side : 37mm/ 1.46 inch;Total Size : 55 x 6.5mm/ 2.2 inch x 0.26 inch (D*T) Material : Metal;Color : Black Weight : 20g Female Thread : 52mm/2 inch Size(Approx) : 54 x 6mm/2.1 inchx 0.24 inch(Max.D*H) The 52mm-37mm ring adapter easily screws onto the front of any 52mm lens, and converts the thread size of your lens to the thread size of any other 37mm accessory (such as filters, hoods, flashes and lens converters). Adapter ring is suitable for filters, close-up lenses and other attachments to lenses with different filter thread sizes. The Bower 37-52mm Step-Up Adapter Ring easily screws onto the front of any 37mm Lens, and allows you to convert to the 52mm 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.