Adapter rings are labeled from the camera to the filter.
For example, a 25.5mm to 46mm step up ring is used for a camera (or lens) with 25.5mm threads. The adapter will allow a 46mm filter (or other adapter ring) to fit.
Adapter rings can be stacked. To use a 49mm filter on a 25.5mm camera lens, first use a 25.5mm to 46mm step up ring and then a 46mm to 49mm step up ring.
Specification of our adapter ring as follow: *M25,27,28,30,30.5,34,40.5mm,43mm,46mm,49mm to 37mm *M37,40.5,43,49,55,58,62 to 52mm
*M52,55 to 58mm
*M55,58,62,67 to 72mm
*M67,72,77 to 82mm