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copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double copper round M2 Length camera monitoring copper stud Round security double knurled 21MM column head stud pass column double