This large expanding ring mandrel for lathes fits ring sizes 7 to 14. The set also includes an Hex wrench for expanding and contracting the mandrel. STEEL: Our ring expansion mandrels are made of carbon structural steel, which is stronger and less prone to deformation. EASY TO USE: This expanding mandrel can be easily used on lathes. Each ring size has extra space to accommodate the tape so the inside of the ring 't get scratched. For proper functionality, apply one or two coats of tape over the steps you be using. This helps protect the inside of your ring. Features: Rotating the ring on a lathe make making the ring 10 times easier than using a rotary tool or other methods. You can easily swap out any size and get a snug fit in seconds. Precision: Expanding mandrels provide a high level of precision when making rings. Designed for use on lathes. Also suitable for drill chucks. Colour:As Shown Material:Stainless steel Size: Tool 1:90x32x6.5mm, 1 piece Tool 2:89x12.5mm, needle:8mm, 1 piece Tool 3:96x24mm, inner diameter:12mm, 1 piece Package Contents: 1set * ring stretcher Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.