Function: Converts the thread size of your lens to the thread size of any other accessory (such as filters, hoods, flashes and lens converters)Easily screws onto the front of lens of the same threadBrand new & high quality. Solid and light-weight .Great tightness, no wobbling or -threadingSuperfine frame polished with strict surface treatmentApplication Fits any lens with the same filter thread; manual or autofocus, digital or film. The first number is always the lens thread size, the second number is the filter size of the accessory. If the first number is bigger, it's a step-down ring. size:49MMMaterial: Aluminum alloycolour: BlackPackage Contents:1 x lens filter adapter ringOnly 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.