Free images results:
 

Restrain pictures, stock photos and images

 
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Barbwire Royalty Free Stock Photo
Author: Belka
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Restrain Royalty Free Stock Photos
Author: Kojinaka
Abusing Royalty Free Stock Photos
Author: Konradbak
Hammer Stock Images
Author: Toneimage