Window lock replacement

A quick learner from Illinois says:
Hi,
I could not find the brand of window on my 20 years old house. These lock levers keep breaking as these are made of plastic. I am looking to replace these with stronger metal levers.
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Casey from SWISCO responded:

Our 38-090 locking handle looks like a good replacement. I am afraid this piece is not made in metal. Looking at your hinge, it seems it is almost time to replace it. Our 36-048 ought to do it, as long as you replace both the top and bottom at the same time. Look over both parts mentioned and let us know if any other questions come up. 

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