Spinning your ring on a lathe will make ring making significantly easier compared to using hand tools or other methods. You will achieve a more professional finish most of the time. If you're making multiple ring sizes, this steel expanding ring mandrel set is ideal because you can quickly swap between sizes and achieve a secure fit within 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. It's effortless to use this expanding mandrel for lathe. There is extra space on each ring size to accommodate tape, helping keep the inside of your rings scratch-free. For proper function, apply a layer or two of tape to the size you are using. This helps protect the inner surface of your ring. The expanding mandrel provides a high level of precision when making rings. Designed for use in a lathe, it also fits in a 1/2-inch drill chuck. Our expanding ring mandrels for ring making are made from wear-resistant stainless steel. Unlike materials such as wood or carbon steel that may rust or wear down, these mandrels are built to last even with 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 the color shown in the image compared to the actual item. Measurement may vary by +/- 1-3 cm.