Ring Stretcher: This ferrule is made of hardened stainless steel. It consists of three parts: a tapered pin expander, a collet multi-stage mandrel and a nylon mold. Features: This convenient ring stretcher quickly and efficiently stretches and enlarges rings and bands. It's lightweight and portable, so you can work anywhere in the world with ease. Function: First place the ring on the stepped chuck, select the suitable size for the ring, and then place the expansion clamp on the base. Then insert the tapered pin rod and tap the top lightly with a hammer. Simply wipe the other end to remove the mandrel. Usage: Used for stretching all soft precious metals such as silver, gold, and copper. Great for woodworking, construction, engineering, jewelry and metal shaping. Dimensions: This ring stretcher tool has a ring size capacity of 6 or larger, base inner rod size: approximately 6-1/2 inches. For use on precious metals only - do not use on titanium, tungsten, stainless steel, gem-set rings, etc. These metals are delicate and can break. Colour:Silver Material:Stainless steel 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.