window locks to let window open half an inch

A friend from England says:

Do you sell anything to enable a picture window to be locked with the window open half an inch? I think we have double glazed metal windows.

Thank you.
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Tom from SWISCO responded:
Thanks for posting! I think you may want to consider our 26-367 Face Mount Single Action Vent Lock Kit. This may be what you're looking for. You should also look at our existing video on how this kit is installed and how it operates.

A friend from England says:
Thanks for your reply - looks promising, and the video was helpful.
A landlord from orange county, california says:
Is this device only designed for a single sash window? It looks like it wouldn't lock the upper sash.

Also, does the device work for wood windows?
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Tom from SWISCO responded:
Thanks for posting! Unfortunately, no. The 26-387 cannot keep the top sash from being pulled down. It can, however, work for wood windows. You may also be interested in our more old fashioned 20-013 Wood Window Vent Lock Set.
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