ZruiXuan Ring Sizer, Ring Stretcher Expander for Drills, Rotary Tools, and Lathes, Professional Jeweler-Approved Ring Sizer, Includes Allen Wrench

Expands metal rings to size 6 and above. This product is not intended for use with rings with gemstones. It can be used on all types of metal. It's easy to use. It's designed for use with a drill, rotary tool, or lathe. Turning a ring on a lathe makes expanding rings easier than using a rotary tool or other methods. It almost always produces a much more professional finish. If you're making rings of multiple sizes, this steel expanding ring mandrel set is a lifesaver. Using this expanding mandrel on a lathe is effortless. Each ring size has extra space to accommodate tape to keep the inside of the ring scratch-free. For proper function, apply a layer or two of tape to the step you use. This helps protect the inside of the ring. No cutting or splicing of the ring is required. Expand the ring by pushing the metal apart from the inside. After a few hits, you may need to soften the ring to prevent it from breaking. This product cannot be used to expand more than one size (e.g., from size 6 to size 7). Please read the instructions carefully before use. The expansion cone can be used on rings of various sizes. Simply place the ring you want to enlarge into the expansion cone, then attach the expansion cone to the base. Insert the tapered rod and tap it from above to expand the ring. Great for woodworking, architecture, engineering, and shaping metal.