Sterling Silver Cord Pinch End 3mm. Ideal for leather cord and other similar materials. This size will work with 2.5-3mm cords. Place the cord into the centre of the finding between the four prongs. Place the tips of a Nylon jaw or round nose plier around the outside and gently squeeze. This will bring two opposing leaves into conatct with the cord. Rotate the pliers through 90 degrees and squeeze again, this will bring the remaining two leaves into contact with the cord. Repeat if neccesary until the cord is secure. The ring on the end has an outside diameter of approx 3.5mm.