This highly versatile tool will produce round and oval jump rings in seconds, as well as giving a square, clean cut to watchbands, tubing, sizing stock, etc. The handy v-block will hold items up to ╝" (6.4mm) in size. Made of stainless steel and silicone bronze for long life. HOW TO USE JUMP RINGER supplied with three round rods: 1/8", 1/16", 3/32" and two rectangular rods for oval jump rings. The rectangular rods are shorter for easier removal of the coils. 1. Select the hole that best fits the size wire being used. Wrap the wire around the rod making a coil. 2. Release one end of the saw blade from a Jewelers saw frame and pass the saw blade through the center of the coil. Secure the saw blade in the frame 3. Swing the jump ring cutting end of the jig around the cut of the coil. For most jump rings use a 4/0 saw blade.