Description <br> Our expanding ring mandrels for ring making are made with wear- alloy. While other materials such as wood or carbon steel rust or wear down, these ring expanders withstand the test of time even with heavy use. <br> Heavy duty annular tensioner and reducer combination. No need to hold it with your hands. -duty base allows you to maintain stability while enlarging your ring. You can easily change any size and fit comfortably in seconds. <br> Its effortless to use this expanding mandrel. There is extra room on each ring size to accommodate tape to keep the inside of your rings scratch-free. For proper function, apply a layer or two of tape to you be using. This helps protect the inside of your ring. <br> Tha zinc alloy about 2.36 inch(6cm) in diameter, 6.89 inch(17.5cm) high.Expanding mandrel offers a high level of precision when making rings. <br> The ring adjuster is suitable for most rings, both mens and womens rings, and also suitable for all kinds of materials and styles of rings. <br> <br> Colour:As Shown <br> Material:Metal <br> <br> Package Contents: <br> 1 * ring stretcher <br> <br> Only the above package content, other products are not included. <br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. <br>