Top horizontal section along the curve: 10 & 5/8″
Top horizontal section height (top to bottom): 1 & 3/4″(ends) to 2″ (toward middle)
Middle vertical section from top to bottom: 7″
Middle vertical section width (left to right): 2 & 1/8″
REMEMBER: T-Visors are installed from the inside of the helmet so a little bit of overlap is a good thing.
Fits Merc helmets as well as many others.