49mm-52mm Step-Up Metal Adapter Ring
(Lens (49mm) to Filter (52mm)) New Japan Dot Line
Lens to Fit = 49mm
Filter to Fit = 52mm
This Stepping Ring enables a filter with an attachment ( 52mm Filter / Tube Adapter / Lens Hood / Lens Cap ) size of 52mm to be used with a lens of 49mm.
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. If the first number is smaller, it's a step-up.
Still confused email us to clear it up further also look second picture to help you out.
We do combine S&H charges.