These are old windows I believe the hooks hold the windows close other wise you can just push on the glass and it partially opens up even though the window is close
Thanks
Jeff
Lauren from SWISCO responded:
February 8, 2024
Hi Jeff, thank you for posting,
Please start by reviewing the 39-537 lock assembly pair or the 39-538 nylon cam lock pair. Review the dimensions to see how they compare. Let us know what you think and if you have any additional questions!