7x3.5mm copper clamshell bead tips with a bottom hinge and double loops at the top. Bead tips conceal and protect knots for a professional finish. Use to attach silks and threads to metal findings. Simply slip your thread through the hole in the clamshell and tie a knot. Fold the sides of the clamshell together to close. Make sure the knot is large enough to not slip through the hole in the clamshell. Sold 10 pieces per pack.