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knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round knurled head camera stud copper pass double monitoring stud security copper round Length12MM double column column M2 Round