20 5/8" X 38" Window clamp rings

These rings are used with our 20 5/8" X 38" Double paned window. There are two options for thickness with these rings. There is a 3/8" and 7/8".

Please measure carefully. Measurements can vary 1/4".

Outer Dimensions are: 20 5/8" X 38".

Inner Dimensions are 19" X 36".