STRYBUC INDUSTRIES 900-18130-4 Window Screen Full Turn Button - pack of 4 - Amazon.com
Turn Button - Onward Hardware
Insect Screen Panels for Windows - Insect Screens Online
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Prime-Line PL 14843 Storm Door Turn Buttons, Zinc Plated Steel (2-Pack)5), Screen Door Hardware - Amazon Canada
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Old Style Cast Iron Turn Button Door Catch | 1 7/8" x 9/16" | for Flush Doors, Shutters, Drawers | Antique and Modern Furniture Hardware | UA-797-BK - Amazon.com