Spinning your ring on a lathe makes ring making significantly easier compared to using a rotary tool or other methods. You will achieve a more professional finish in most cases. If you're making rings in multiple sizes, this steel expanding ring mandrel set is highly convenient, as you can quickly swap sizes and achieve a snug fit within seconds. This large expanding ring mandrel for lathe accommodates ring sizes 7.5 to 10.5. The set includes a hex wrench for expanding and contracting the mandrel. It features a 7-inch base compatible with a variety of chucks and can be used in a lathe or drill. Using this expanding mandrel for lathe is simple and efficient. Each ring size step provides extra space to accommodate tape, helping protect the inside of your rings from scratches. For optimal performance, apply one or two layers of tape to the step you plan to use. The expanding mandrel delivers high precision when making rings and is designed for use in a lathe. It also fits a 1/2-inch drill chuck. These expanding ring mandrels are made from wear-resistant stainless steel. Unlike wood or carbon steel, stainless steel resists rust and wear, ensuring long-lasting durability even with frequent use. Color: As shown Material: Stainless steel Package contents: 1 x ring mandrel Note: Light reflection and display variations may cause slight color differences between the image and the actual item. Measurement tolerance is ±1–3 cm.