Used in this video tutorial:. How To Use French Wire. . Superfine metal coil (like a soft watch spring) for covering the ends of thread or flex wire where they loop through clasps or other connections. Essential for pearl knotting! Please see our Beadstringing Book or any other beading book for instruction in the use of French Wire. Measurements/Quantity: 1mm diameter outside measurement, approx.5mm inside diameter, 14 inches long in a reclosable box that will keep your fragile French Wire intact.