<br> <b>Function<br></b>  <br> Converts the thread size of your lens to the thread size of any other accessory (such as filters, hoods, flashes and lens converters) <br> <br> Easily screws onto the front of lens of the same thread <br> <b><br>Feature<br></b>  <br> High quality <br> <br> Solid and lightweight <br> <br> Great tightness, no wobbling or cross-threading <br> <br>Environmentally friendly material made of aircraft grade magnalium <br> <br> Superfine frame polished with strict surface treatment <br> <b><br>Application<b></b></b>  <br> Fits any lens with the same filter thread; manual or autofocus, digital or film. <br> <b><br>Remarks</b> <br> <br> The first number is always the lens thread size, the second number is the filter size of the accessory. <br> <b><br>How rings work</b> <br> <br> Step up rings provide a way to fit larger diameter filters or ccessories onto a smaller lens <br> <br> Step down rings provide a way to attach smaller filters or accessories to a larger lenses <br> <br> <b>Package includes:<br><br>step-up ring <br></b>1 X 37-49mm <br>1X49-52mm <br>1 X 52-55mm <br>1 X 55-58mm <br>1 X 58-62mm <br>1 X 62-67mm  <br>1 X 67-72mm <br>1 X 72-77mm <br>1 X 77-82mm <br> <br> <b> step-down ring </b> <br>1 X 82-77mm <br>1 X 77-72mm <br>1 X 72-67mm <br>1 X 67-62mm <br>1 X 62-58mm <br>1 X 58-55mm <br>1 X 55-52mm <br>1 X 52-49mm <br>1 X 49-37mm <br>