I believe it's a casement window "shoe"

A quick learner from Parkton, md says:
Need about 6 of these shoes? 3 lefts and three rights.

Thanks in advance

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Emily from SWISCO responded:

Hi there!

This reminds me of our 36-030, but compare our dimensions to yours and see if this matches what you need. 

36-030 : Roto-Lock Operator Shoe Pair
Roto-Lock Operator Shoe Pair
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