This necklace mandrel is designed with a smooth surface and a steel chrome finish. It is ideal for forming and layout work, along with shaping metal and neckpieces. Mandrel can be used in working with metals and wax-work, also. It provides a work surface that replicates the length and fit of the piece while assembling components of a necklace prior to fabricating it. Components can be set on the mandrel during fabrication prior to completion; plus light metal work can be performed on the mandrel. Weighs 6 lbs. Features a solid, smooth polished surface with no markings. Approximate Dimensions:Mandrel Body: 9-1/4" wide x 9-3/4" long x 6-1/2" in height. Hole: Outer Dimensions: 4" in diameter; Inner Dimensions: 3-3/4" in diameter.Collar Size: 4" in diameter x 1-3/4" in height.Please contact us with any questions. Thanks for looking!