It will be 10 times easier to turn the ring on a lathe than using tools or other methods. You will get a more professional finish in most cases. If you are making multiple sizes of rings, this steel expansion ring mandrel set is your best choice because you can easily change any size and get a tight fit in seconds. This lathe expansion ring mandrel fits ring sizes 7.5 to 10.5. The set also includes a hex key to expand and contract the mandrel. It has a 7-inch base that accommodates a chuck and can be used on a lathe or drill. Using this lathe expansion mandrel is effortless. There is extra space on each ring size to accommodate tape to prevent scratches on the inside of the ring. For proper operation, apply one or two layers of tape to the rings you will be using. This helps protect the inside of the ring. The expansion mandrel provides a high level of precision when making rings. Designed for use on a lathe. Also fits a 1/2-inch drill chuck. Our expansion ring mandrels for making rings are made of wear-resistant steel. While other materials, such as wood or carbon steel, will rust or wear, these ring expanders will stand the test of time even with frequent use. Color: As shown in the picture Material: Stainless Steel Package Contents: 1 pc x Ring Mandrel Above package contents only, other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowable error is +/- 1-3cm.