Designed to fit over a 2 x 2mm (or smaller) crimp or knot for a more finished look Starts out looking like a "C". Using your fingers or pliers, place cover over crimp/knot then use smooth jaw flat nose pliers to form into a 3mm bead Corrugated Design 14 karat Gold Filled is composed of a solid layer of 14 karat Gold mechanically bonded to copper or brass. Thicker than plating so it will not chip or wear away. Treat just like solid 14kt gold, in terms of care & cleaning