Bowstring Nocks Set Buckle Clips fit Nocking Point Archery Hunting can stabilize the site for bow, ensure more accurate positioning suitable for bow strings range from 10-16 strands the inner layer is anti-slip material to protect the bow string convenient to use, just need to use plier to clench the copper buckle specification: material: copper color: as picture show size (width x height): approx. 5 x 5 mm / 0.2 x 0.2 inch package includes: 6 pieces bowstring nock set note: since the size above is measured by hand, the size of the actual item you received could be slightly different from the size above. meanwhile, please be reminded that due to lighting effects, monitors brightness/contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item.