Spinning your ring on a lathe will make ring making much easier compared to using hand tools or other methods. You will achieve a more professional finish consistently. If you're making multiple ring sizes, this steel expanding ring mandrel set is ideal because you can quickly swap sizes and achieve a secure fit in seconds. This expanding ring mandrel for lathe fits ring sizes 7.5 to 10.5. The set includes a hex wrench to expand and contract the mandrel. It features a 7-inch base that fits most chucks and can be used in a lathe or drill. Using this expanding mandrel is simple. There is extra space at each size to accommodate tape, helping keep the inside of your rings scratch-free. For best results, apply one or two layers of tape to the mandrel before use to protect the interior of your ring. The expanding mandrel provides a high level of precision when crafting rings. It is designed for use in a lathe and also fits into a 1/2 inch drill chuck. These expanding ring mandrels are constructed from wear-resistant stainless steel. Unlike materials such as wood or carbon steel that may rust or degrade, these mandrels are built to last even under heavy use. Color: As shown Material: Stainless steel Package Contents: 1 x Ring mandrel Note: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.