Comes with 11 different size jump ring mandrels- 4 x 6mm, 5 x 7mm, 6 x 8mm, 4mm, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 16mm & a wire twister Together in one convenient set, you can twist wire and make custom jump rings in the sizes and wire gauges you want! The Beadalon Jump Ring Maker comes in different mandrel sizes so you can make just the size you need. Try coiling vivid Artistic Wires into colored Jump Rings to add definition and texture to jewelry designs, or use gold-filled, sterling, or base metal wire to fashion components that complement your designs. Use the Wire Twister to make pre-twisted color combinations, then make twisted Jump Rings for all your jewelry or craft projects. Once twisted, multiple wires have more strength than single wires. Easy to use, fast, and fun. Once you try making your own Jump Rings you may never want to stop!