Beautiful Bead Silver Plated Clamshells Knot Covers 3.7mm for DIY Necklaces Bracelets Jewelry (50pcs) Fashion, exquisite items in bulk. Silver plated, easy to match with different styles jewelry. Measurements: Each side of knot cover is 3.7mm in diameter with a 1mm hole. It is necessary for making beading necklaces & bracelets & Earrings. Cover the end knots on your jewelry thread or cord, and fasten your cord to a jump ring or clasp with these antiqued silver plated brass clam shells!