Bower 48mm-49mm Step Up Metal Filter Converter Adapter Stepping Ring
(Lens (48mm) to Filter (49mm))
Lens to Fit = 48 mm ( Male Threads = 48 mm )
Filter to Fit = 49 mm ( Female Threads = 49 mm )
This Stepping Ring enables a filter or an attachment ( 49mm Filter / Tube Adapter / Lens Hood / Lens Cap ) size of 49mm to be used with a lens front threads of 48mm.
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.