KF-Concept-Metal-Stepping-Rings-3758mm-Adapter-Step-Up-Filter-Ring-37MM-Lens-to-58MM-Accessory-for-Canon-Nikon

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 thread

Feature

Brand new & high quality
Solid and light-weight
Great tightness, no wobbling or cross-threading
Superfine frame polished with strict surface treatment

Application

Fits any lens with the same filter thread; manual or autofocus, digital or film.

Remarks

The first number is always the lens thread size, the second number is the filter size of the accessory.
If the first number is smaller, it's a step-up.