Antique Copper Clamshell Bead Tip, with 'clamshell' style closure to hide knots or crimps. Open hook closes easily to attach to findings such as rings or clasps. These are sometimes also called 'callottes' or simply, knot covers. Finding is about 9mm long and clamshell area closes to approximately 4mm in diameter. Sold in packages of 36 pieces.