The width that covers the glass on the exterior is 1/2 inch wide. From the top down, the one inch height is comprised of a section that is 5/8 of an inch to the first barb then 3/16 of an inch to the second barb (smaller than the first). From the second barb to the bottom of the side there is 3/16 on an inch.
I have attached some pictures to help you understand my description.
