This is for a milky window and measures 9/16 in on both outer sides. Both inside measurements are 1/2 in. Thank you. MILKO ( spell check )MILCO. WILL GET IT RIGHT NOW. SORRY
Paul from SWISCO responded:
January 8, 2018
Take a good look and compare our 55-029 snap-in glazing to yours. Is it the same thing you need for your Milco window?