window slide clip
A distributor from new hope says:
May 2, 2016
for an awning window, it is the slide clip to hold the arm
Tom from SWISCO responded:
May 3, 2016
Thanks for contacting us. This looks like a slide off of a hinge set. I'm afraid these slides are not available by themselves. You would need an entirely new hinge set. See our 36-013-10 to start out with. I think this can help you.