Choose a size that gives you the best clearance from the window casement. Proper clearance from the surface of the housing is important for ventilating purposes.
5 Stars still the same after 75 years
Samuel - Professional restoration specialist from OH wrote (September 13, 2011):
It's extremely difficult to find specialty hardware such as these shutter hinges that are designed to do a specific job. I was so pleased to see that I could restore the shutters on my historic home with the same hardware that had been installed 75 years ago. These are designed to either hold the shutters fully open or fully closed and they do what their designed to do!