Vinyl glass stop
A quick learner from Vista, ca. says:
April 11, 2016
This came off of the fixed side of an operable milgard window.
Tom from SWISCO responded:
April 12, 2016
It looks like you have a handful of glazing. Could you take a picture of just one? That way we can make out the shape and find a good match. Please also give me your measurements.