Step Up Adapter Ring Material : Metal Male Thread : 40.5mm/1.59inch Female Thread : 52mm/2inch Size(Approx) : 55 x 6mm/2.16inch x 0.24inch (Max.D x H) Adapter ring is suitable for filters, close-up lenses and other attachments to lenses with different filter thread sizes. The Bower 40.5-52mm Step-Up Adapter Ring easily screws onto the front of any 40.5mm Lens, and allows you to convert to the 52mm threads of accessory items (such as filters, hoods, flashes and lens converters). Color: Black Weight: 21g Package Content: 3 x Step Up Adapter Ring Only the above package content, other products are not included. Note: Light reflection 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.