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Also, here are some commercial RF-licensed images that match your search criteria:  
Screw-clamp Stock Image
Author: Ka_ru
Screw-clamp Stock Image
Author: Ka_ru
Screw-clamp Royalty Free Stock Photography
Author: Ka_ru
C-clamp Stock Photo
Author: Sriharun

Explore more commercial options: More Clamp Stock Illustrations & Vectors | More Clamp Stock Video Footage