Manufactured in JAPAN 49-58mm step-up ring. Allows the use of 58mm filter or attachments on lens with 49mm filter thread size.
Some digital and vintage lenses (eg Pentax Olympus Yashica etc.) have 49mm filter thread size E49.
The female thread is 58mm (often used by Canon Sony and many other manufacturers). Excellent quality in metal with black finish, very tough and durable.