Special jeweler's tool - use it to hold split rings open while you slide other rings onto them. Great when you have to open a lot of them! Non-slip Xuro-RubberŸ grips and light weight make it easy to use. Works with all sizes down to #00. MADE IN U.S.A. Measurements: Pliers are 5.25 inches long, tips are 2mm at the narrowest point, with the splitting point smaller than 1mm. Sturdy lap joint construction. Leaf spring. NOTE: These pliers are intended for beading and other fine hobby work. Not recommended for heavy duty applications such as automotive, home improvement, or maritime use.